Very Poor Response Rate and Commitment to Dates

In approximately November 2014 I approached a company called Celtic Tuning to modify the software on my vehicle. The company has a 14 day customer satisfaction money back warranty as stated on their website also. The car started surging at a certain RPM and throttle position. So when I had made the correspondent (Martin) aware of my problem his response were very slow and my problem I had wasn't even addressed until the 14th day since I had my software modified. So I suggested that I want my software to be reflashed back to stock and my money refunded. Martin then insisted that they will find a solution to my problem and that I must give them more time. <br> <br> I have been doing everything in my power to help him resolve this issue and have been doing what ever he had asked of me. He asked for me to have the car's software updated before he reflashed it the first time, and I did it. He asked me to have the Lambda sensor checked by Ford after the last time he had done the software, which I did and they found nothing wrong with it. <br> <br> Now he has been consistantly ignoring me and I just find this unacceptable since I want my software reflashed and money returned which he agreed to.