How can a tourist in Thailand handle visa extensions and residential reporting without a contract in their name?

I come Thailand 22 Feb with 2 month tourist visa.

I want to take 1 more month for now and I went at Siratcha immigration at 19 April. I ended PAY FINE 800 bath for not show where I lived before.

The story is, that I was informed from my friends when i came, but I stay in my girlfriend name rent contract and 2 times we tell him go police but he not do. More I must say that he lie to us. He told us he gone but he did not.

So how ended the story?

The day I must take the visa I understand they will not give to me. And I drive 80 kilo, (go, come back and go, come back again) for find him in banglamung hospital for give me the paper and authorise my girlfriend do for him and of course him not pay the fine. But about 3 o clock I finish.

So I have some questions....

2) How someone can do with out contract in his name?

When I go police before (for check if I am ok) with contract in my girlfriend name they tell me that the owner must apply the form with my name.(As I told before i told him again and he say yes but he not do)

So how we do as tourist ?

The time I mention that i go, I had a contract and an other form with my name as a guest (but not an authorization from him) Not up to me that the owner not go. Why I pay the fine?

You have any ideas?

2)After I told to police that next month I go Cambodia for 1 month more and after I will go again immigration for 1 month extension. How I will do for not have the same problem.

They answer me that after come back from Cambodia and in 24 hours only, I must show again my address.

2) I do his job? Next time i go again with the paper prove where i stay and an authorization from him that i do alone. For that police tell me 24 hours?

And if this I do for him, what a tourist must do?

If he done before as an owner what a tourist must do? And how long we have time for show up to police for this address check?

And they give us the small paper for immigration? Same they give me now and go with it to immigration?

3) I know from my friends that price for fine in pattaya is 1600 bath.

Is up to them?

4)Also one friend stay in Bangkok per month, (but hotel make the form). Him not go before for the paper but in immigration give him visa. So he no need go to police for the small paper.

And no fine.

And generally...

5) How a tourist will learn about that new low if Thai authorities not inform?

6) Is this only for us that we want extension?

Because all other tourist not need go immigration. When finish the month or the days they have holiday they are free leave the country.

Or in the airport take them to jail with no court.

Sorry about my joke but I an angry with this. And plus because I can not understand for after what I do.

Thanks and....

Sorry for my English and sorry for the long letter...