Contract ends but deductions still being made by Telkom

My contract for 10GB day 10GB night ended in May and Telkom has made calls prior to the "end of my contract" to check if I want to renew it, which I explicitly refused on several occasions. They have since deducted money from my account for these past two months. I called to enquire why this is the case and the agent I spoke to said that the data had already been allocated for June (not sure who authorised this as I did not agree) and there won't be any further deductions to be made to my account. Needless to say around the 5th of June 2021, the SIM was inactive and coundn't access the data for the month. They have deducted the amount again this month and upon inquiry I was told that no official termination was logged. May you please assist as I don't understand why money is still being deducted from my account for a contract that has ended and data that is supposedly allocated, i cannot use? I have received really terrible service from Telkom and they make it impossible to amicably come to the end of a contract