R14,000 in 3-4 months

Hi, if been with vodacom with my same number for a decade now. This last year whas so unpleasant that i have decided to end all my business and personal contracts with them. I canceled one of my contracts two months before it ended. Everything went acording, but after 5-6 months thy started billing me R3000-R4000 amounts! After investigation i found that the contract was never canceled, and that thy are billing me on my other number for that. Any way, i just thought i should share, maby someone will help. Cost me more than R10,000