Reliance Home Comfort

I was told by a customer service rep that I was overcharged for monthly service and that I would be credited for the overcharged amount. I was also advised that my account details would be changed to prevent future over charges. Reliance was supposed to contact me in 1-3 business days.
One week later I hadn't been called or credited but did get a new monthly bill for the same overcharged amount.
Call number two to customer service got me some apologies but not much more. I was told to ignore the bill and that someone would call in 1-3 business days.
It's now a week later and nothing has happened to the account and no phone call has been received. Today I made call number three and was told that I would be called within 1-3 business days. I asked to escalate my issue and did get to speak to a customer service manager. Got another apology and was told that the back office deals with this and customer service can't do anything except offer a courtesy $50 account credit. I was told that I would be called in 24-48 hours.
The result of all of this is:
-I am still waiting for my refund/credit
-I do not have full confirmation that my account billing has been corrected going forward
-I am still waiting for anyone from Reliance to contact me

I DO NOT recommend that anyone sign a contract with these people.
Please know that my issue is with the company and their back office.
This isn't an issue with the powerless customer service department. Those unfortunate people get to take the heat for issues that are beyond their control and in the hands of people "higher up" than them.