Telkom been trash since forever

I am an existing client with 2 data contract went in to get four phone contract as gifts to my kids. I only got 2 instead now I had to go back to back them they told me they will credit vet me which is fine cause I afford it. What's grinding my gears is the fact that I have a debit mandate with them but over the past 6 months they did not debit me but of course I want to keep my credit score clear I pay via eft. Recently they have tried debitting me with no luck because I had already paid they had the audacity to charge me a R202 rand it's utter bull****