Poor Service deliveryYet so quick to demand paymen

I booked in my Iphone for repairs and immediately when the repair center received Sms was sent to me confirming which was fine . Day after received Quotation sms of R3630 and accepted , The following day received another sms stating that handset was ready for delivery pending receipt of full payment within seven days and that was on the 4/9/2015 and on the 9/9/2015 full amount was paid into Mtn bank account and since then haven't received any sms or any feedback . Now it is my responsibility to follow up on the whereabouts of my handset till today 16/9/2015 still don't have my phone. Would be highly appreciated if Mtn would follow up to their service and stick to the time frames that they give customers when it comes to payments when they deliver service