(I had found that the company were lying when they said they couldn't possibly pay me more than $5 an hour, in fact they were probably earning more than $20, so I was a little bit pissed off) 

I had sent a fax 3 weeks previously to my boss saying that the students wanted to do another course and I would teach it if I got more money. I had hoped he would be busy organising it , but he never contacted me to negotiate terms. So I thought that when I went to the office on Thursday to pick up my wages he would negotiate with me then. I presumed his technique was to play the strong man and save the negotiation to the last minute to put pressure on me. 

I hate doing business with people you can't trust , it's too stressful. You have to be paranoid and think of every possibility. I was wondering what technique he was going to come up with in order to pay me less. I decided I needed to be very firm ..I would get paid for this project , then I would negotiate. If they didn't want to pay the money I wanted , I wouldn't let them bully me. I would leave and go to Peru , as I had to leave the country and re-enter soon to get a new visa anyway. 

In the end we didn't even negotiate. I had sent him a fax asking when I would get paid and I understood he said on the telephone he would pay me on the day after the end of the project. They kept me waiting 2 hours , then he gave the salary for last month I looked at it and asked him when he would pay me the money for the rest of the project. He went crazy shouting ...I had to trust him , he wasn't a thief , he was a super-Christian etc he was raving for about ten minutes. 

..BTW wasn't Adolf Hitler a Christian too . I seen people all over the world who call themselves Christians because they go to church on Sundays , but six days of the week they don't behave in a very Christian way ! 

(Well if he's a Christian ..let God judge him !) 

I asked him to calm down and said I only wanted to know when I would get paid. 

He eventually came up with this plan ..I would continue working as normal while he negotiated with the students , then if there was no agreement he would pay me. I wasn´t going to let him bully me into working for the same money . I could see his negotiations going on for 1 week, 2 weeks etc . Why hadn't he negotiated already ?  

I thought I could just leave, it was only $35, but then I thought NO I worked for this money I'm not going to let him keep it . I told him no way the project had finished, I wanted to be paid now and I wouldn't work until we negotiated new terms. He said he didn´t have the money. I said "I won't leave this office until you pay me". He disappeared upstairs and a minute later came with the money, and whe was not in a good mood as he escorted me to the door. 

I prefer to do business in a friendly way , then you can get a win: win situation. By forcing me to show I could be tough and Cabron like them .They lost, I lost and the students lost