the visa is a multientry visa, valid for 5 years allowing you to stay 180 days on each entry. It does not allow you to stay for 5 years! If you do, you will be fined and banned from entering Thailand for 10 years... Or you will get caught sometime during those 5 years = detained at IDC, procecuted, fined, deported at your own expense and banned.
I'm sorry to say this, but you are short on time and even if you find an agent they too need adequate documentation from you.
I doubt that any agency can help you to get a tourist visa in only 6 working days.
The processing time in Pretoria (where Angolans apply) is approximately 7 business days* once a complete application is submitted...
*Certain nationalities take longer as the Royal Thai Embassy in Pretoria have to get approval from their headquarters in Thailand first to issue their visas. (I don't know if this applies to Angolan nationals or not.)
The Royal Thai Embassy in Pretoria do not offer expedited service = meaning an agent can't speed up the process.
However, besides having a year lease in Thailand, he apparently have a condo in Malaysia where he spend a lot of time too... hence my guess is that he is worried about his number of visa exempt entries, rather than border bounces.
I think he "kind of" answered you by "...you are not limited to any number of entries till the day you get stopped entering. For £30 or so I'll keep them sweet and buy a visa."
I assume that he has entered visa exempt x amount of times and that he is worried that "the day he's stopped from entering" is approaching. I get the feeling that the OP wrongfully believe that a tourist visa would exempt him from being denied to enter.
well, technically you are right - you can merge several docs into 1 pdf. However, if there are no place in the e-visa system to upload accomodation details, then where are you planning on adding this pdf?
I suggest that you create an account on the Thai E-visa platform and start to add your details. That way you can decide if and where you should upload a pdf about your accomodation.
I understand that you want to plan ahead, but since you have a problem obtaining this document and the e-visa platform doesn't require it, my suggestion was, and still is, to apply with the documentation that are in fact asked for in the system and wait. They may or may not ask you to submit additional information. And they may or may not use the exact wording "proof of payment...", but there is a chance they might ask for it in a different way too, like in the NZ example "proof of accomodation, e.g. hotel booking..."
If it were me, I'd apply and wait to see what they ask for (if anything), but of course you do as you please. If you can come up with a solution on how to prove that you paid for accomodation that's great!
You wrote "Not sure if owner or agents would supply tax number on a reciept"... that lead me to believe you hadn't asked.
Anyway, as Brandon mentioned in another comment, there are nowhere to upload this information in the e-visa system... so if you really want to apply in KL - do so - while you figure out a solution what to do IF they request additional information from you regarding accomodation. If you are lucky the wording in such a request might be different... you won't know unless you try.
I'll add the requirements as they are listed in NZ as an example, see number 8. They ask for "proof of accomodation in Thailand, e.g. hotel bookings..."
I did understand the specific requirement. I mearly suggested that he could TRY, pray and hope! Hotel bookings for the entire period doesn't seem to be enough either (even though other embassies accept that) - they ask for "proof of payment". So the best is, of course, if he can get a reciept from the owner of the accomodation that he actually pays for... it doesn't seem like he's even asked!
...or he could just give up his Tourist Visa application in KL!