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@miro_o
It's always worth getting the mechanic to go through everything they've done to the bike, saying how things were, and showing how they now are. Good bike shops should do this anyway. Small bikes shops are the best because you get the same wrench each time so you know who to bribe with biscuits/weed.
Assuming your frame and chainring are straight it sounds like it could be your front mech. Here's a link for how to set that up.