Unlocked a my phone paid 40$ then they told me it ...

Unlocked a my phone paid 40$ then they told me it could not be fix and did not refund the money back. I said just do something for me at least but refussed to cooperate. Iv used these guys in the past and also when in the flea market and recommended other friends of mine. But never again was not about the money juar about the principal.