1530 repair question

[hegan66]

Hi there:
I love rolex's and have several, inherited and bought.
I recently got a nice vintage piece, an unmolested 5552 with a 1530 movement that I bought specifically because I'm rough on things, and wanted something that if I bashed it up, i wouldn't feel bad.
It ran fine when I got it. I sent it off to a well reviewed watchmaking shop (not an official rolex service center) in a major city for clean and oil, and a new barrel install on the rotor.
The work was completed but twice now, the mechanism will fail to regulate and will start gaining several minutes per hour. I sent it back in the first time, and it was reset and returned, and now I am travelling and it has again started to run very, very fast.
I am at a loss what the proper thing to do here is. The 1530 is a simple movement, and i was told that it was in good condition when it was initially submitted for cleaning.
In a situation like this, am I justified in pulling payment through the credit card company and just sending it back to Rolex? I used an unofficial service center because I wanted to keep the original dial, hands etc, but moreso now, all I want is my kick-around Rolex to keep time.
Frustrated.... but thanks for any input.
S-dog