Telkom Billing for no Service!

Good day

My contract expired in January 2021 and thus I send a cancellation via the online portal for 10 February. On 25 February my bank account gets debited with R631.62 and I reversed the amount because they have billed me incorrectly for Device Subcription fee, Freeme 1 Gig, Free me promo ALL-NET Voice Minutes and Call to SA Netwoks. After reversal of the funds, I've made a manual payment of R340.00 of what I actually owe them. I made sure to call Telkom and asked is my account closed and cancelled and they assured me that its closed until I received the invoice of R631.42. I've called them again and asked why the amount of R631.42 and they said not to worry, Telkom will only bill me for the 1GIG and free promo and NOT for the device description which I didnt asked for!!!!!. Today I received a bill of R494.32 and this amount add up to a fee of R202.70 for reversal and R291.62 FOR THE OUSTANDING AMOUNT OF FEBRUARY. How can the charge me for something that has been cancelled???? I would understand that they've added me data and that Ive need to pay it, which is also not my fault, but to bill me for device subscription is ridiculous. To top it off, they said the will credit my account and I refused and instead reversed because two years ago, it too my 5 months to get R400 credited to my account after lots of fights and their poor administration. TELKOM I HOPE YOU SEE THIS PLEASE.