Using OneXOX prepaid too.. At first macam got free 2 years validity?
Just pay RM25 yearly if totally didn't top up.

If got top up from time to time I think they will extend the validity based on how much you top up.

As I am mostly WFH, I just reload 50-150 into my account and buy season pass when there's promo. 10+3-5 GB @ RM50. Then just subscribe to 1GB/ month. Use damn long..

Haven't found anything cheaper and convenient like oneXOX prepaid so far.