Bad MTN Customer Care Service and misleading sales

3rd Party offered special on contract upgrade but what they promised and contract provided was not the same. Contacted MTN as well as Mondo to cancel/reverse the **** upgrade. Ref No from Mondo RCO138639. Submitted this on the 23rd September and to date no action was taken. Calling MTN Customer Care to try and resolve matter but nobody answers. Already on the line for 35 minutes and still going with nobody assisting. Upgrade submitted and still not reversed