MTN Service VERY VERRRRRRY POOR AND SLOW!!!!

I am really getting very very very incredibly mad with MTN. I never had a problem, until a couple of weeks back when a sales agent called me for an upgrade. After confirming that the upgrade was fine and to proceed is where the problems started and back and forth calling - them bouncing me from department to department, wasting hours of my time waiting to talk and explain the problem to a new person every time - them telling me "sorry their system is slow, please can I wait patiently", then putting me on hold for several minutes and sometimes the call then just miraculously drops...

I don't know, but I am now fed up with MTN and their non-existent service delivery. Is there another way to get issues resolved than dialing 135 and waiting waiting waiting in frustration. I am now struggling to resolve my problem for 3 weeks now and still nothing is resolved - I have numerous tickets opened and closed, but still nothing is resolved... Really really PATHETIC service by MTN.

As I said I never have had issues, but now all of a sudden something small happens and then the struggle starts to get it resolved. Their systems are very slow all the time and they have millions of departments and then they just bounce you from department to department...

If anyone at MTN can assist with this, my last reference number is *** for the accounts department. Thanks.