Telkom *****ing my money

Telkom debited my account with R14 521.90 on 30 November 2018, which I know nothing about since I don't have a single account with them. On 15 December 2018 they debited another amount of R16 549.90. On 25 January 2019, R18 870 .60 was debited again. 15 February 2019, another debit order for R20 808.60

I keep on asking my banker to reverse these unauthorised debits. This is such an inconvenience as I can't use the money I worked hard for. It takes few days for the money to be returned into my account. I'm worried one day my full salary will be taken by this Telkom and all my debit orders will be returned due to no funds in the account. Can Telkom please stop with this.