Bad service

I have been on hold with the Unisa call centre for a total of 10 hours for the last 2 days. My call was successfully connect twice and both times the agent drop my call without even greeting. The reason for my call is that my account is blocked and i am unable to register even though my financial details on the same website shows that Unisa owes me R510. My account is settled and all i want to do is register. I have sent a total amount of 10 emails in the last day as well as 15 SMS's and have not received a single response. This is utterly *********** behaviour. We all understand that staff is busy but if you are unable to take calls or answer emails, dont have that service available to the public. State, that even though you guy pride yourselves in distance learning you still require people to take time of work and queue in numerous lines to actually be assisted!