Dis connecting internet 10 Gig Uncapped.

I have been a Telkom internet 10 Gig uncapped customer for many years. On 7 October my internet started to disconnect. Logged a fault and were told it's a cable fault. After about 2 Weeks they send sms to say it's fixed. Well. Not so. Still keeps disconnecting every few minutes and takes time to connected again. I have send countless emails. Sms. Phoned. To no avail. A technician come at end of October and said my 10 Gig makes my internet look for higher frequency and suggested he put it on 8. I agreed as long as I have service as my data costs are through the roof. Still no difference. I have received 3 fair usage emails already. I understand fair usage as I have been a customer for about 7 years. It's not throttled it's disconnecting. What is so hard to understand. I'm so frustrated. I really Hope that Telkom will react in this problem as they did not on my emails and phone calls.