Cell C - No data coverage anymore

The worst experience ever. I got a data contract with Cell C from January 2019 and everything went smooth. Got amazing download speed and were very satisfied until last week. No connection for data. Went into the store and were told that MTN cancelled their contract with Cell c witch make use of MTN network coverage / towers. I now have had no internet / data for the last week. Worst is that the sales person informed me that they don't know for how long the problem will last and they cant do anything about it. i lost 5gig of data and now have to pay for a full month for data that i'm not going to get as a result of Cell C not having adequate coverage of their own. I phoned Cell C on 084 143 and spoke to the operator regarding the problem and to this date no feedback regarding the problem. I want to cancel my contract with immediate effect as Cell c broke their agreement to supply data (that worked fine for 4 months) and cant deliver it now. Not even to mention the 5Gigs i lost as a result of this.