unhappy customer telkom

For years I am a Telkom customer, and I always have received dismal services .Every month you have to pay your account religiously, but they will never credit your account, and never respond to any emails. About a year and a half ago, wireless was installed at our offices, as the adsl services was so bad.There were no fiber in our area, that I was force to go wireless. That was a complete nightmare ever since, it was installed at our offices, we had to use, our tenants Wi-Fi or buy data. I have emailed how many times. ,Today again. I have ref no and disputes, I want to cancel my wireless, and Telkom must reimburse me.