Paid but no Delivery (order no ***)

I registered, purchased online and paid for MTN's Steppa tablet on the 08 May 2015. I got an email of 5 - 7 working days turnaround time for delivery. I called them again on 13 May and was told the tablet is going to be dispatched soon and the delivery company will call to arrange delivery. The call centre agent also said they will escalate this matter as I should have been contacted by then. Then on the 19th May, MTN was on strike and was no longer responding to calls!!! I am very disappointed as my order should have been finalised before the strike! I will never purchase anything else from you people! No emails, no Calls, no communication from you! This is how you treat customers!