Complaint Review: Potters Plumbing and 'tile

I was given this Plumber by my Contractor Antonio Monterio did not know this person but trusted my Contractor...He Proceeds to draft a contract dated 12/29/16  and asked for $1200 for a overpriced $1600 job.  He did about $400 worth of work and used very cheap materials...also my HVAC guy said he used his pipe...Then I called him to come drill the hole for the to vent the gases in the roof...he did not respond for weeks came by one day and took some parts away I would assume the shower control valve that was needed or I would have to takeout the sheet rock that I put in...Because he did so little I had to buy from Homedepot with Reciepts about $369 worth of materials that were needed >according to my Plumber from Georgia he only did work on in a 4 ft area>no supply lines to the upstairs>he said it was ready but far from it ..no putting the toilet or sink in no shower control valve to the bathroom and not linked to hotwater heater at all...I am at a minus of the $400 he is owed and he is so horrible that I have to go get a new shower apparatus and shower control value at the value of $87 ....This person is no professional and got an extra $800 out of the $1200 and only did $400 worth of work.