Failing Email And Customer service

Its been over 3 months since I have been trying to access my Vodamail mailbox with no success, I have also been in 2 different vodacom outlets to seek help with no success. My email is very important to me and I haven't been able to delete mail or upgrade my account to make space so I can receive new mail. Each time I log in I receive an error message and vodacom technicians can't do anything about it.