Never skip a payment but not getting what was offered to me

I reported bad internet services in around February 2017. Technicians was sent to my home (inconvenient) every time I re logged a fault. In the beginning, Telkom said that a technician was dispatched to my situation but there was no one ever. After a few more fault logs, they actually start sending the technicians for real but this went on for quite some time until in around June, July two "underground technicians" was sent to my home and they actually found a problem. There was a cable damaged under ground which they needed to get contractors to dig (don't have an idea what this meant). Never done! Each time the fault was closed and solved according to Telkom but, every time it rains, I get intermittent internet connection and my internet is never stable. it was not so bad but it got worse during the time. I re logged a fault again on the 1 ste of November again, 12 of December and again, i think on the 20 th of December (not sure). No one is phoning me, no one is telling me what I need to hear and worst of all, NO ONE IS FIXING THE PROBLEM. I am so tired of complaining and wasting a lot of airtime on these guys for nothing. If I don't pay, my internet will be off no questions asked and no warnings given. What do I as the customer do if Telkom does not deliver their end of the deal?

Is this not contract breaching?