I was contacted a few weeks ago and offered a price lock on a package with installation etc

I was contacted a few weeks ago and offered a price lock on a package with installation etc. Installation was done on 12th September and a week later I had a problem with signal and called the call center and had to xall the installer to come back and fix the problem . But the biggest issue is now the billing and when i went onto the dstv app n did a live chat with an agent they were giving me the incorrect amount to pay . I pointed out that the billing she sent made no sense and I asked that someone from management calls me , 2 weeks later the consultant never did escalate my complaint/query .