Cell C

I need your assistance please. Since 30Nov.21 Cell C debited more from my account, without my concent or knowledge. When receiving bank statement, I noticed they deducted R212, for Nov. 21, R321.14 for Dec21, R320 for Jan21 and R320 for Feb21. The contract were for R129 per month. I immediatley phoned them. They informed me, my contract expired. I were never informed by Cell C of this case and they decided to upgrade without my concent. On 7th February 2022, I updated my contract to R99/month with 5G day and 5G night. At the end of February 2022, they again deducted R320. I furthermore telephonically, update my new personal details. When receiving contract, they didn't update any of the changes, I asked them to. I have been correspinding with them since the 7/02/22, 01/03/22, 04/03/22 and 10/03/22. They promise me everytime feedback. Up to date only received a case number, with a promise they will contact me. Cell C deducted in total of the past 4 months R688.04 more than they have permission to, which were R129/month and for end of February 2022, R99/month. I asked them to refund the access the take from me, without my concent. Please, help me, regarding this. Thank you in advance