Contracts suspended due to receiving full payments

All our Cell C contracts have been suspended for the past 5 months for no reason at all. Every month we get an sms stating their payment has been received but the service remains suspended. Cant even phone CellC from their own provider when your service was suspended! After phoning CellC from a more reliable provider, they said we are still over R200 in arears. They dont know where this amount came from, and dont know why this amount doesnt show on any of our invoices. We decided to pay this outstanding amount regardless of not owing them the amount, yet all our contracts are still suspended. Worst customer service and administrative support in the world!