Telkom Pathetic Customer Service

I took up a contract with Telkom to start effectively from December 2020 and come.end of December 2020 and Jan2021 I have been incorrectly billed and they took more than what they should be deducting and I queried this from beginning of January till now, and only refunded me R329 on the 11 Feb but that is still short, they owe me more, and every time I call them, they give me same ref number: ***0 as if something will be done to correct this but nothing comes of it, I don't think I will continue with these fools going forward, they don't know what they're doing, poor customer service and it's pathetic, they don't care about what customers going through, I'm tired of asking the same thing over and over again, and if they don't sort this out, come month end I am terminating this **** and move over to people who have my interest at heart