UBER DEDUCTING R50 EVERYMONTH FOR NO REASON

Uber has been deducting R50 from my account for the past 3 months now. Everytime i report it they tell me that someone requested using my card and their account and when i check with family members no one has used my card. I tried explaining to uber that the R50 they are deducting is probably for the Uber One which i cancelled a long time ago but they still insist that someone has been using my card. I even went through the lenghths of deactivating my uber account and was surprised to see a R50 being deducted today again. Their customer service has became horrible honestly.