Low to No Internet Speed

I have experienced low to no internet access due to extremely low LTE internet speeds. Phoned Telkom twice now and no response. Last night I was advised that queries are resolved in 9 working days (which can be between 11 and 13 calendar days). Basically I'm paying a full months rate for half the agreed service. When indicating that I then want to cancel my contract I was advised that this will be another 21 days. All the contact center keeps saying is it handle by the back office and they can't do anything.