Best Reverse Osmosis System Repair in Tulsa OK

Devon came out today was going to charge $49 for service call, then he said it would be $378.00 after tax to clear floor drain under hot water heater where it was backing up water all over garage floor he didn't find any blockage  and it wasn't backing up when he left but as soon as he left it started overflowing again all over garage floor. Soo I called him, he said he could clear it from the roof but would have to come back out the next day because of rain and it would be another $378 dollars I told him NO WAY i didn't have that kind of money!!! So now stuck with using shop vac every time i flush the toilets..STUCK WITH NO MONEY FOR REPAIR!!!