What alternatives can my friend use to prove his current location for a Thai visa application?

Hi guys, so my friend (an OIC holder) is applying the DTV from South India and he has provided all the required documents. But the immigration is asking for addition papers which says -

"Document indicating current location: Upload a government issued current location document like a national ID or rental agreement. Note that it should be a location from South India".

The issue is, he has already submitted the entry stamp, hotel receipts and reccomendation letter but they still do not accept. So, he has tried to get "Form C" from the hotel but turns out the hotel which he has been staying for 3 weeks has been registered under a different catagory and thus, cannot provide it. The immigration in India also said that it's the hotel's job to give Form C and that he cannot get a reccomendation letter from them either.

So, he has called about 20 hotels so far if they can provide it and none of them even know about the form. There is two 5 star hotels which may provide it (not guaranteed also) but the rates are very expensive.

We are trying to think of an alternative way but cannot come up with anything else. Is there another way to prove this?