Business ProfileforBulldog Roofing

Last September I signed a contract with Bulldog for fixing the leaking issue of my roof with the amount of $2317.73. But after they removed the tiles, ***** said I need to pay additional $1780.70, otherwise they would do nothing even though I had paid. That sounds ridiculous, but I just wanted to fix the issue ASAP since tiles were already removed and I can't recover them myself, then I had to pay another $1780.70 to make them finish their work. They didn't update our contract to add that amount $1780.70 and just sent me an invoice. That's it. The contract shows $2317.73 but I paid about $4000 eventually.However, after several months later, the roof leaks again at the same place this February. That's really ridiculous. I paid them nearly $4000 but nothing is fixed. I contacted ***** and he had a really slow response after a month. He came here checked the leaks, then said they can't find this leaking spot when they were doing their work last year and I have to pay about $3000 again this time to fix it. He just wants to add more money again and again but the issue is never fixed!!! That's totally unacceptable. I just want to have my money back and hire someone professionals to fix the issue and my headache. Please help me on this. Thank you.