Had plumber from water works come to fix a drain b...

Had plumber from water works come to fix a drain backing up into bathroom sink. He put a snake down drain line didn't pull anything out but put hose down saying it was now clear ok so when we hook everything backup and attempt to use sink the drain again backs up...clogged. Just like it was when we called. Seemed like drain was flowing again but seems to be that since we have not been using the drain because of issue the water wasn't as high. In pipe but when try to use the sink as regular use it backed up / clogged again. To have them come back out because it was later when we figured out problem was still occurring they threatened an additional $200.00 fee. Now mind you the plumber was only at our house maybe 15 minutes if that but the fee was just over $300 bucks. So they threatened additional fee because it's now evening and if we want them to come back out to fix problem they said was fixed today because of the time that we figured out dude never fixed drain We are penalized cause we have the audacity to ask them to come back out today they say it will be a $200.00 fee if we come out and it's not the same issue...but because we have been duped a few times before we are now waiting til Monday because they would figure out way to make sure it was a different issue on top off issue they supposedly fixed but didn't. Considering they said the issue we had was already fixed and already charged us over $300 dollars for not even 15 minutes work I have no doubt in my mind they would say it was a different issue and add on $200.00 fee for making them come back out and then on top of that charge another $300.00 cause they had to maybe do 20 minutes instead of 15 minutes they charged $300 dollars for eArlier. Plumbers and electricians man it's a racket. Heck with illegal stuff they rip you off legally.