Disappointed in the service

I have been trying to get through to the cancellations department via my phone since Saturday and I keep getting told they are experiencing high call volumes. I have tried using the self help avenue as well, but no where can I see where to cancel my contract.

I have one account that I wanted to cancel a few months back, but apparently the service staff in the call center do not know the word NO. I was eventually convinced to keep the contract and they would reduce the cost and amount of data I am receiving. I ws fine with this. However, I went into one of the stores and asked if there was anyway I could have that data loaded to one of my other contracts where I get airtime, but no data. The young gentleman said he would load a query and someone would phone. Someone did, but I missed the call and when I tried calling back there was no reply. Now I see that the original amount of data has been reloaded - 100G and the price increased again.

This is not what I wanted. Can someone please call me as you are impossible to get through to. Call center agents need to listen to what the client wants. No is also an answer.