Vodacom refuses to take responsibility

I upgraded my data contract telephonically and specifically stated that I was using a data sharing SIM and asked if that would affect anything. I was told it would not affect anything. On the 30th of September both SIMs were rendered inactive and upon querying I was told that it would only activate on the 1st of October. I paid data till the end of the 30th and Vodacom saw it fit to ***** data that I paid for. Subsequently the data sharing SIM remained inactive and after several calls, being ping ponged on their call centre and sent to a store, Vodacom now expects me to migrate to open line and pay more than double the initial contract price even though the promotion is still on and is what I signed up for. I am told cancellation would mean me paying 75% of the contract. They refuse to take responsibility for any error and have rendered be unable to use the contract for my purposes and nor can I cancel. Surely this can be reported to the ombudsman as unfair?