unauthorised debit order for 3 years discovered

To HelloPeter,

An unauthorised debit order from R58.00 up to R80 with reference number: Optivest ********** 7 Sagepay, has been deducted off my bank account on the 1st/2nd of each month between Nov 2014 and Oct 2017. I neither have any idea how Optivest got my bank account details nor do I know what services I am paying for from them.

I would like a refund for the sum of all of these debits between these periods and the R3,75 bank charges for every single debit.

Kind regards Maria