Had tires put on at sears. Motorist started telling my rear tire was wobbling.
Found out aluminum rim was bent. Sear told because I didn't balance
The rear tires, that caused the rim to get bent.
Is this true

Not balancing a tire will cause a vibration, but not a bend. If they just put tires on and didn't balance the tires a vibration will occur.

Did you hit and curbs and anything else?