Most terrible customer service provider

I had a contract which I downgraded in February. After that I was still being invoiced for a service that was downgraded. Did a query which was only sorted out in July. Then again in August I was billed for the service that was downgraded. Being struggling with these idiots since then to sort out the query. Calling them every week and they say they will get back to me within 72 hours. But no one gets back to me. It's been almost 3 months with no response. Everything time you call they make some kind of nonsense excuse. Telkom is very quick to debit our account but they customers service stinks. They are full of **** and I won't recommend any one to deal with them. The people working at telkom are very ***********. And don't know what is customer service satisfaction all about. I just can't wait for my contract to end. I will never ever deal with Telkom again. They don't understand the frustration of calling the customer service and getting pushed from pillar to post. Most horrible service provider I dealt with.