Telkom mistreatment of the customer

I informed telkom mobile that I changed banks, and for some reason they debited the previous bank account which didn't have enough funds as I'm no longer using it. Instead of Telkom Mobile calling me to find out what happened, they suspended my services (17 Nov). I called them numerous times to find out what is wrong with my router, some agents told me to restart my router some promised to call me back but they never did. Eventually, around the 21 Nov, to my shock, they told me that I missed a payment. When I offered to pay immediately they told me that won't help as the debit orders have probably already ran. Now, to this day I'm still waiting for my services to be resumed and I've tried to excalate my query, but no one seems to care or to even try to call me back. I run a business that relies on internet, and the amount it's costing me on daily basis to use other providers on prepaid (cause my Telekom is blocked) is insane. Can someone from telkom call me back.