Mtn data contract

I am not happy with MTN Homemark ***. I was telephonically assisted by Hurana. I signed up for 8GB data for R40pm. Immediately after our conversation I received an sms indicating 40GB data package for R160 pm has been activated. He sold me the wrong package. When I call them their phone is forever on hold and I sent them an email there was no even automatic reply. M so aggrieved