Bad customer service

I was on a contract which was expired on one of my vodacom numbers and the consultant which was helping me didn't want me to cancel which is normal so I agreed to downgrade with an agreement to receive a R500 voucher. Also too change it just to receive 100 mb of data and to lower my payments on my existing contract. He didn't explain to me that I will lose whatever benefits I had on my main no would fall away and that he would be starting a new 24 month contract on that day for my main no.he also said I have a cooling off period if I change my mind of 14 days. I didn't recieve any voucher and when I wanted to cancel the agreement before the 14 days where up it seemed that nobody could help me. To date whenever I contact that particular department I'm given a ref no every time saying that they will contact me but I'm still waiting for a call this was in August . I'm beginning to wonder should I change networks .I've been a faithful vodacom customer for more than four years if not longer.