2 months postponement

I have always been a consumer at Telkom, but lately they have been ignoring my complaint. For the last 10 months I have been paying for a 4 MB line but only have been receiving a 2 MB line. I want my 4 MB line. Telkom has sent me a reference code and according to their app it is still in works. No one phones to give me details or how far or what the situation is. I phoned the call centre about 10 more times. Even they were shocked by how long they take. The emailed the managers aswell and still no response or fix. I have given this case to the onbudsman and looking to take this case to court.