I went to a 2 million plus house in Highgate London to price for an extension to a CCTV system and intruder alarm system, the price was reasonable. He then argued about the price for 15 minutes, I explained that if I did not make a 15% margin (the price he wanted to pay was at a 7% margin) I would not be paid my commission, he then said ".don't care about your commission to which I replied.
"If I don't get my commission I don't give a flying f*** about your security systems" he signed the paperwork without another word.
Ive just had a customer with the same type of property . Decided he was going to rearrange my price by £800 in his favour and tell me my time frame to do the job . I laughed , said ok and hung the phone up . He called a week later and asked when I was fitting the work
His wife is now in charge