Development Specialists refused to address issue

I'm writing to complain about the warranty service I received from Development Specialists. After paying $308.34 for service, I found that it encountered rude staff. I've tried resolving this with your customer service team multiple times, including speaking with Tyrell U., but have not received a satisfactory resolution.

I'm writing to complain about the warranty service I received from Development Specialists. After paying $308.34 for service, I found that it encountered rude staff. I've tried resolving this with your customer service team multiple times, including speaking with Tyrell U., but have not received a satisfactory resolution.