Complaint Review: My easy pay finance

I brought my car into Perfect at 4295 Fort Apache in Las Vegas, NV, 89147 for a smog check and supposedly it didn't pass which was very curious since it passed last year and there was probably 100 miles max put on my car since then. Chevy the manager told me that they would need to do a diagnostic check to find out what the problem was and it would cost me but if they fix whatever the problem was they waive the diagnostic fee. So allegedly it was a faulty intake boot. I was told it would cost $143.00 to fix. I told them I didn't have the money and asked if there was something else that could be done so it would pass the smog test. Chevy said they could extend me credit with their finance company well I was caught between a rock and a hard place because I needed my registration tags, so I agree to finance the repair. After they had ordered the part and gave me a receipt for $350.00 on services that had not been done (and mind you the repair was supposedly to only be $143.00) they told me they would call me the next day and so I waited all that next day for their call and finally ended up just calling them myself and was told they were just getting ready to call me. Fast forward to the difference of $145.00 store credit which of course I will not use because I don't trust them. Apparently, the myeasypayfinance.com finance company has a 90 day no interest and they charge a $40.00 admin fee right off the bat unbeknownst to me and after that they charge a 96% interest finance charge. Which would mean that at the end of two years I will have paid a total of $798.00 for a $145.00 questionable repair. and I will be also paying inter on a $145.00 credit. That's highway robbery! Granted they have a signed contract, which of course is legally binding. That's called Loan Sharking and it should be illegal! I will do everything in my power to warn people about their unscrupulous business practices.