Contracts not being cancelled

I have requested that several of our company contracts be cancelled that have expired. 2 people helped me Wendy and Andre Engelbrecht. Andre has subsequently left the company and the contracts that I urgently needed cancelling was never cancelled. Thus we had to pay additional contract fees up until date. I require a refund on the money that we had to spend on these contracts and require them cancelled with immediate effect as well as other contracts that are up for cancellation. This is urgent as our overheads are very high and Vodacom just expects us to keep on paying for their staff who cannot do their work. I do not have a problem with Wendy as she has always been willing to help but also cannot action all my requests as she is too busy with other walk in customers. This is becoming a huge problem for me as Vodacom never assigned me with a business account manager. We have been promised several times someone will come out and administrate our accounts but no one has bothered to pitch up in the 3 years that I have been in charge of our company account with a total of 93 Cellphone Contracts. Please Help....