Vodacom business account unable to resolve issue

I placed an order for 50 x handsets. When the handsets we delivered, they were NOT the model that i ordered. I sent back the handsets to vodacom to be replaced by the correct model. I was notified that the model i initially order was discontinued. I made the decision to cancel the entire order. From here the trouble started. The phone lines were activated on the account and my account started getting billed. I notified the agent who sold me the contracts. The communication had confirmed that the issue will be resolved. The billing continued. The email threads are getting longer, with the same excuses. This matter is now handed over to their legal department, and i am at risk of damaging my credit record due to vodacom's negligence. How can this issue be resolved without damage? Has anyone on this platform found the correct channel to deal with this organisation on similar matters? What is the best way to bring this matter under the public's attention to avoid others from suffering the same personal damages?