Fair pipelines pricing for sole developers

So I thought when I attached my card for overage minutes, that if I bought 1000 minutes I would have 1000 till I ran out, turns out this is not accurate. I would like an extra minutes plan where the minutes roll over (I didn't think we had to talk about roll over minutes anymore :/ ). See I'm the sole developer on a lot of my code, so I don't need to give someone else access, and usually if I go over 50 minutes it's only maybe up to 70 minutes, and some months I won't do anything at all. I think 1000 minutes for $10 is a good deal, but not if it's use 'em or lose em, 'cause then it's $120 a year for only a few minutes over. I've removed my payment details for now, because of this. I would be happy to pay $10 for 1000 minutes that roll over though.