Terrible service from Telkom Mobile

I made the mistake of switching to a telkom mobile contract 3 months ago. Apart from the terrible coverage no debit ordet has gone off of my account since switching. Now I have been receiving sms messages from Telkom threatening me with blacklisting and suspension of my service. I've tried calling them, tried the "call me back" function, tried the online chat, but gave up everytime after waiting longer than 10minutes for someone to assist me. It is literally impossible to contact Telkom! Quite ironic that a telecoms company has no funtioning telephone line. If someone at Telkom reads all their complaints please assist me