I've been with Telkom for many years, since 2015 And I've always been a loyal customer, I've never missed a debit order

I've been with Telkom for many years, since 2015 And I've always been a loyal customer, I've never missed a debit order. I even pay in advance if I have money. Last year I lost my job and I contacted Telkom to ask if they could pause my account until I get a job. And they told me NO. Then obviously I couldn't pay anymore. Weeks went by and my sim card was locked, I couldn't make any outgoing services. They I called them to open it up. And they said NO. Finally I couldn't use the SIM card anymore so I threw it away. Today my cousin sent me R3500 for school for my kids. And guess what Telkom ? It deducted R2085 from my account without authorization. I want my money back. My kids have to go to school. Please help me get my money back