UNSATISFACTORY Service received

I had a contract taken out in Dec 2021, few months down the line I was not getting the Data that I was suppose to get, I have reported the matter, it even got to the level of a Regional Manager and still not sorted, insteading I got an ugly email from the Manager of that specific store via email. So I opted to stop paying the account since they not taking the initiative to fix the problem. So now they have blacklisted my name.