breach of contract

Upgrade, a month later I check my data....and I found that what was agreed to Mtn did not do. Was promised normal data and YOUTUBE DATA.....DID NOT RECEIVE THE YOUTUBE DATA. I phoned and I was told they don't see any youtube data. I was transferred to their data department... was on hold for 18 minutes...when the line went quiet.....and I disconnected the call.... the worst service ever.