If you're always folding to their shoves, then stop opening light or be prepared to call. If they are decent, which seems to the case because they expect a fold nearly always they can literally 3B shove any two cards.
If you know they are doing it light so often, then why are you not adjusting your opening/calling ranges?
Calling ranges really depend. If was expecting to be shoved on nearly always I wouldn't be opening a hand I was willing to call off. If someone is shoving like 80% of hands, then just work out our equity with pot odds
with our exact hand and see if it's profitable. Can't give you an actual range to raise call off with because 20bb-30bb stack sizes are quite a big difference in stack sizes in tournaments and it really does come down to how often they are really 3B shoving vs our steals. You could very well just be feeling each time you steal they re steal etc.