No feedback or follow up

I sent an email to MTN customer care department as i need a contract to be cancelled - I emailed them on Friday last week 17/04/2015 @ 11:55am to customer [Email Removed] and have had no response still to date.<br> We went into there store on Sunday to enquire about an upgrade for Wireless connection and the lady was supposed to phone us to let us know when the item we required will be in stock and we have still heard nothing. It's really disgusting that they don't follow up with there clients, and when i call the number we were provided with it tells me the number is invalid.