Unauthorized debit order bySagePay SA UNATHI

Good day

I got a bank notification that an amount of R99.00 .SAGEPAY on the 16th March 2019. I haven't given this company or person to debit any money from my bank account or what product do they offer to the public. This people are busy with our bank account without our authorisation. Tried calling their number without any success ITS ALWAYS BUSY. Please stop doing ***** in our bank accounts

Rose