Comcast business retention is useless

I recently bought a business on September 1st. I already had called and set up a new contract. I get a call from retention department and previous owner advising me to do a transfer of ownership. I was hesitant because his bill was few hundred dollars more than what I was quoted. I go along with their advice and do a transfer of ownership. My new contract price with better speed and more tv channels was roughly $250 compared to his $500-600/month. 

I did the transfer of ownership and I was told by Brian Morgan (retention department) he will get me under contract with same price. He does and installation team came out and was confused because there was NOTHING TO INSTALL. Since this was a transfer of ownership and getting under a contract. All equipment was already there. Brian says they needed to install a booster. Well now my account never got the install so it was pending for a few days. Kept calling to get this fixed. Two billing cycles passed and my bill was nearly $2700!!!  Kept calling and calling and the tech oils keep saying Brian needs to fix it since there is a lock on it??. Also calling Comcast is the most annoying thing since you have to deal with the stupidest automated system. Now it’s been nearly 50 days later and nothing. Finally a person decides to help me but I need to pay $1100 and they will credit me after I get under contract which again Brian has to do. So now after paying I email Brian again and it’s been 10 more days and Brian Morgan has no solution.

I also asked to speak with a supervisor weeks ago and no call back them either. 

If there is any competent employees at Comcast, please help.