Incorrect billing

Following the migration to the new app I had double deductions. In January I received a refund as the amount was R99 and R89. The 1st was refunded. A repeat in February. I login to chatbox and report this whereby I upload my bank statement and I'm told the amounts show as unprocessed and they've only got 1 amount on record. Come March and again, same situation. Two amounts of R89 taken, following the run around I leave it for the amounts to clear or show as processed. During the week I follow up. Same story. They pick up one amount and I must go to my bank. I call in and I'm told they'll investigate at a R80 charge which sounds unnecessary as now that is the installment so I go to the branch. I get there and I'm shown these double deductions and the difference in deduction and processed dates. I'm asked for a letter or email confirming the refund which I don't have. So I rush home and go to chatbox. Again I explain the whole scenario and this agent acts confirms the double deduction. So I ask check and confirm if perhaps I don't have another address linked to my name. Due to ***** I exercise great care with my logins and bank details and I proceed to check my Google subscriptions. After a whole day of back and forth now it comes up its a yahoo account. Conveniently so as I had a free trial which I ended. Also how come it's taking double for that account only from February? No proof of login? No proof or history of prior payments so how come. Mind you after repeatedly querying for two months no one picked up this address or double payments as it gows off as a card purchase. I've been confirming my Gmail and no mention of possible other subscription just same old we see 1 payment. This incident has now been repeated twice after raising this issue is completely unacceptable. Sure its not lots of money but why the lack of attention or investigation.