Difficult Cancelling Supersonic FLTE

I called Supersonic earlier this month to downgrade my fixed LTE contract to the R499 package. The accounts consultant confirmed it will be downgraded by month end. I then later also decided to cancel the contract. I sent an email to ***. I got an email reply confirming that I will receive a phone call to confirm cancellation. Its been over 2 weeks and no call. Please assist as I need to cancel this contract.