If they topped up (as opposed to changing) the oil, an elemental oil analysis would give you a clue as to whether significant damage was done. though of course it wont fix it. Bearing wear will put excess lead (and perhaps copper) in the oil.
Probably more commonly done in the US at the consumer level than in the UK, but for 40 quid or so might have given you clues/some peace of mind.
32.5 quid from these people, who apparently give you large (abnormal wear) particle analysis that the standard method misses.
oilanalysislab.com/buy-oil-analysis-kits/
You could do it before your next oil change if you still have the car and are still concerned about possible bearing wear.
4WIW, due to being distracted by the blazing row that tends to follow whenever I attempt to get GF's to help with car problems (that's MY excuse anyway), and/or/aka simply my stupidity, my car was towed in gear for a few hundred metres with the oil below the pickup pipe. This certainly damaged the bearings, since I could see bearing lead sediment in the sump when I subsequently took it off.
Its still going 7 years later, but I do run relatively thick oil.
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