Airtime advance

I'm so unhappy with vodacom its not even funny.Everytime I recharge airtime either via bank or voucher my airtime gets deducted apparently I'm paying for an advance I know nothing about.I started experiencing this ordeal beggining of January 2025.I have contacted vodacom telephonically of which didn't help and even physically visited Vodacom Sammy marks square in Pretoria cbd couldn't get any assistance. A consultant on the 22nd January 2025 confirmed that someone is requesting an advance using my number and immediately transfers the airtime. The consultant couldn't give the numbers which the airtime was being transferred to.Im now sitting with R260 outstanding advance balance of which I know nothing about. Why does vodacom deduct my airtime everything I recharge yet they don't want to reveal the number of the perpetrators collecting my airtime.