Worst Customer Service

I kept getting billed twice on my account. Both on my statements said Telkom . All their operators know nothing about the 2nd Debit. For 3 consecutive months I have to go to the bank to query it and reverse it. Then eventually they say it's Nudebt they handed over an up to date account. Every month I call and they either will call me back but never do or when they do they say it's sorted until again the same story the following month. Can I get someone to call me back and sort this mess out. You guys are messing my credit status.