ouch mate tbh i would say that it sounds a little 50/50 tbh if/when i get timing belt done i always buy a full kit and change tensioners etc at the same time so i'm not too sure what to suggest but i am sure they'll be someone on here that can help a bit more
just to clarify i'm in no way saying it's your fault surely the garage where you took it should've recommended changing the tensioners at the same time as the belt but that's just my opinion