Poor service from their call center agents

I've been trying to upgrade my contract with Telkom for over a week. I don't even know where to start. The level of service from their call center agents. None of them know what they are doing. I've been calling everyday since the 13th with no assistance. Everyone of them is telling me a new story and blaming the previous one I spoke to. I've been with them for several years never have i received such poor service.