Vodacom deducting money from my bank account

I took 2 x R75 voucher advances on 15 April 2023 on the Vodacom app and then they deducted 2 x R75 from my bank account on 2 May 2023 which was what was suppose to happen. Two days later on 4 May 2023 they then deducted another 6 x R75 from my bank which equates to R450. I have then notified Vodacom on numerous occasions to say what happened but all they are doing is sending me from one department to another without my issue being resolved. I have even sent Vodacom my bank statement to prove what happened but still nobody can help me to get my money refunded. This is so frustrating and annoying that I have to go through this trying to get my money back because of a error that Vodacom made.