Cellc poor service

Shame to say I am an existing client of CellC , I have been chasing them to resolve a query and days have been passed and no solution to date, the agent sold me a product last month and now I am being charged for it but not getting the service , I have resorted to putting a. Stop order on my debit order due to the poor service. I wish they provided the same service as when they selling a product, absolutely dissatisfied of CellC service, same results after speaking to 3 agents.