Extend my contract for your negligence Telkom

I'm highly disappointed with the service my dad and I received since we did a sim swap at the Telkom Mobile store at Kolonnade. The modem contract is under my dad's name but I am the primary user. When my modem got ******, we we did a sim swap at the store and asked that they make me a secondary account holder (if that's what it's called) so I can call the customer centre if there are any issues, instead of asking my dad to call all the time. We live in two different cities so it would be easier if I, being the primary user, can call and liaise with Telkom. As my dad and I recall, that wasn't done. Furthermore, my dad changed banking details and went to the kolonnade store to update them on the system - that wasn't done. Since around October, I haven't been able to use the modem because it was blocked due to it being unpaid. We called Telkom in December to enquire, gave them the new banking details, they followed it up and told my dad to pay to avoid legal action. He did, and he updated his bank account again in January. However, it only worked once in January and has since reported that I'm out of data. impossible, I get 10 gigs every month. The contract ends in March!! ******!