Disgraceful and disgusting service!

I have purchased fuel vouchers from Vodacom to the value of R1000. I got through to someone on their specific needs number after struggling for weeks to get through to their customer care line. The lady refused to assist me and told me to continue to call 082135. They keep putting me onto their idiot robot Tobi. My vouchers are about to expire and they refuse to help me. What should I do? This is not my first experience with Vodacom and their customer service. It is disgraceful, disgusting and utterly pathetic!!!!