Incompetence at Telkom is STAGGERING

I cancelled my Telkom land line on the 28th May 2015, giving 30 days notice. The line was disconnected on the 28.06.15. TO DATE, Telkom is still billing me. I have called numerous times trying to sort this out. I get told that the credits will be passed, the dispute has been logged and it will be escalated. Latest invoice recieved (22.09.15) STILL SHOWS THAT THIS HAS NOT BEEN SORTED OUT. I have just spent another 30 minutes on the phone to this *********** bunch only to be told the same story. Then to top it off, the call centre agent can't give me a ref number for today's call as her system is offline. Telkom: you SUCK.