We regret joining Telkom

Telkom is taking advantage of my 71 year old mother. My mother subscribed to Telkom unlimited 10bps WiFi for R449 in April 2024. Since then the amount has never been a constant R449 but has rather been fluctuating. April 2024 they debited R539, June 2024 R539, July 2024 R539, August 2024 R539, September 2025 R524, October R458, November 2024 R527, December 2024 R449 (1st normal instalment), January 2025 R449 (2nd normal instalment), February 2025 R881, March 2025 R927, April 2025 R927, May 2025 R534, June 2025 R449 (3rd normal instalment), July 2025 R616, July 2025 R949, August 2025 R949, September 2025 R1897, September 2025 again R352.89. I have tried to cal multiple times to assist my mother resolve the issues as I have calculated that she has been over debited R3077 and credited with R1200 (R1877 outstanding credit to my mother). I have spoken to Madisa, a Telkom consultant who asked me to email all the queries Telkom statements, I sent the statement and he confirmed that he has received the statements and he will escalate to his Supervisor Pinkie and he committed that Pinkie would call my mother within 48 hrs turnaround time. Pinkie never called and our subscription was terminated. I called again today after realising that Telkom debited R352 on the 15th September 2025 without any authorisation from my mothers. There has been no communication nor consultation with my mother regarding the queries we have raised. We called again and spoke to Nokwazi Nkwa**** who said she will not be able to assist nor escalate the call as Telkom only takes accountability for the August and September 2025 debits hence my mother was credited R1200 to refund the debits. I then asked what happens to the debits from 2024 April to July R2025? She said she will not be able to assist nor cancel the contract as it is a 24months contract. She says my mother should now pay R449 subscription+R202 for penalties+R13 interest= R664 to activate our subscription. I want Telkom to credit my mother the remaining R1877 from 2024 April to date and to reactivate her subscription for September since they debited R352 without her authorisation or knowledge. I hate Telkom for abusing my mother and taking advantage of her.