Bad customer service- Mondo

The badest worst assistance. I returned cellphone device and cancelled contract on 7 Jan 2020 due to wrong info given to me,as ut was suppose to be an upgrade if exusting contract and nit "an additional contract". Numerous emails and on 4 Febr Prenusha Maduray informed me on email the contract is cancelled..... Then 20 Febr and again 26 Febr 2020 Telkom Mobile is trying to deduct R3758.87 for the device. Device returned begin of Jan and i keep sending weighbill proof etc through. It is costing me extra money on bankfees to dispute payment and reverse fees. On 26 Febr 2020 I complained vua enail again to Mondo...Phindile Zondo is hardly responding, apologies is no longer good enough. Feedback like it is escalated to management is also not good enough!!! Why must i keep on asking for feedback and why is Mondo not sorting this out? Quick to sell, worst customer service ever if you cancel a contract.