I'm paying for a service your not delivering

My WiFi is currently off. Call centre explain my line isn't synchronizing. They can log a fault, if an agent comes out and the fault isn't with Telkom then there is a charge of R380 for unnecessary call out. Firstly, my account is up to date. Secondly, I didn't install the WiFi and equipment, Telkom did...if you cannot resolve my issue then let's terminate the deal and I will go in search of a more functioning service provider. Every month I have am issue with the WiFi.

If Telkom cannot deliver a service then step a side.