R3 data refill taking ALL my money in one day

I am on prepaid and somehow a R3 recurring data bundle gets deducted off my account. I have cancelled it and contacted Vodacom but its still just taking ALL my money from my phone. If i put in R29 it will take the whole amount in one day with 9 data refills on one day. I have complained countless times....this has been going on for nearly 2 years and i can't afford to lose my number as i use it for my business. I have lost almost thousands of rands due to this.