Data disappears one day before expiry date

I entered into new Vodacom contract., over the phone, which was recorded. Old Contract expires 31st of December. Now December has 31 days as we all now. Last night, the 30th, I still had over 600 MB of Data. This morning, the 31st, I see that old contract was already cancelled, and gone is all my Data!! The 31st Dec only comes to an end at 12pm tonight. New contract has not started yet. So today I am contractless!!!!!<br> Vodacom phoned me immediately after I complained. They want to see what happened to the Data. I know what happened to my remaining Data!! It is always lost when you renew a contract. What I want to know is why my contract was cancelled on the 30th and not the 31st. I wanted to,, and was going to use that Data today, BEFORE they took it away!!!! It is like buying Groceries, you don't eat up all the food, so on the 1st day of the next month the shop comes to your house and takes back all the food you did not eat! Vodacom sms says it can take up to 14 days to sort out. The Client always has to stick to the contract and adhere to their Terms and Conditions,,, but they do as they wish! <br> Vodacom sounded surprized as if I was the only person whose DATA disappeared. Now I