Poor service from cell c

I complained about cell c the other day. I have been receiving phone calls but whoever is phoning does not answer when I try and take the call. It's almost as if they make the call and don't answer when I try and take the call. It will register on their system that they tried to phone. I receive many calls from various people and they have no issues in getting hold of me. However regarding cell c they are absolute *******. I will never use them again even if they were the last service provider on the planet. I would rather use carrier ***eons to communicate.