Lots of lessons to learn from this Mack3601, mostly to do with '
some shops are to be avoided', though not all because there ARE good shops out there, and the advantages of doing at least basic maintenance yourself. Although you're obviously a novice to tinkering with bikes, watch some videos, visit the Park Tools website (excellent how to articles on there) and work on your bike - pushbikes are relatively simple beasts and there's not much you can 'fix' that a mechanic can't unfix
