Clicking your tongue for a client

So i call Vodacom customer care to query why is it that data is not carried over, what happens to my data if i don't use it and why can't i have my data seeing that i did pay for it???? My phone has been in for repairs for the past three months (with Vodacom) i only received my phone 22/08, since about May i havent had a phone to use my data on, so when i queried this with your very rude and unhelpful agent, who had the stinkiest attitude, her reply was that it doesnt carry over and it expires. My question to her was, how can it expire, it is my data and i paid for it, didnt use it, so i want it. I find this highly unfair and Vodacom needs to make amendments to their contracts as that is straight forward theft. I cannot pay every month and NOT get what rightfully belongs to me. I need someone with a brain to explain when i will be getting my data or this will be taken further, as i see this as in your face *******!!!