pathetic service from Telkom mobile

for the last 12 months telkom mobile has been billing me but stopped sending me data since 30/09/2018, after querying it with them and logging a call they claimed they were charging me for the use of the SIM even though it says on my account that the charges is for a device and 5gig data, which i was not able to use in any case as they stopped sending me data sine 09/2018, they also refuse to refund me, so after cancelling with them they went ahead and debited my account again this month, i logged 2 incidents with them, up to now not a single call from them, i had to call in only to find that they keep resolving and closing the cases. after numerous calls the only answer i get is "is there anything else i can assist you with".