Telkom Fibre unable to resolve a slow connection but charges for full service.

Telkom Fibre has been unable to resolve my fibre internet connection is approximately 2 months. I am paying for a 40 mb fiber line but at most only get between 1 and 10 mb. I have repeatedly logged calls to have the problem resolved. The calls are usually closed in 2 to 3 days indicating that it is resolved. The sms then leaves the option to re-open the logged fault if it has not been resolved. It does not seem that this option works as i need to log new calls repeatedly. Terrible service! Come end of the month they will expect full settlement of the monthly fee! As they are in breach of contract I will pay as poorly as they are able to service!