Migration of contract

I went into a MTN store to request a migration of my contract to a MTN Sky package. I received confirmation by the consultant that it had been done and will be effective on my next bill run in April. It has since not and I cannot get through to anyone who can assist me. I requested the change due to my calling needs being exceeded and the convenience that the Sky package has to offer, however, it has been a nightmare having to load airtime on a daily basis and quite expensive. Please can someone tell me what the next steps are to cancel my contract due to unfulfilled obligations from your side.