Vodacom *****ing airtime

I am on the Red Flexi 245 package with Vodacom. I get R245 airtime each month. Every month I do not use all the airtime and it accumulates. Start of December I had over R400 accumulated. Middle of the month I tried to buy data. The balance was zero. Had to buy data with banking app. Start of January got my R245 airtime on 1st of month. Tried to buy data for first time this month on 18th, again, no airtime. I know airtime expires, but not after 2 weeks. I feel cheated and absolutely am not getting what I paid for. Fix this. Dont phone me, I have had enough of your so called consultants. Just fix this. Finish.