Pathetic service to loyal Cell C contract client

Absolute pathetic service from Cell C. Phone unable to make and receive calls more than a week ago. Two sim swops later, for which I've paid, waited more than 50 hours, nothing! Told me to take my phone to Samsung myself, because if they take it, it takes 14 to 21 working days, as opposed to the 1 day if I take it to Samsung (Cell C Centurion Mall). Which is absolute nonsense. They lie to their loyal customers. Phone now at Samsung for repairs. Took spare phone and inserted "new" sim - it does not work - on both spare phones! Utter frustration. And all they can offer is "apologies for the inconvenience". No tech department in their stores. Still unable to work, make calls, losing work. Paying for a non-existing service!!