UltraLink Computing Tianjin refused to address issue

I'm writing to complain about the return process I received from UltraLink Computing Tianjin. After paying $850.32 for subscription, I found that it has poor quality. I've tried resolving this with your customer service team multiple times, including speaking with Dasia U., but have not received a satisfactory resolution.

I'm writing to complain about the return process I received from UltraLink Computing Tianjin. After paying $850.32 for subscription, I found that it has poor quality. I've tried resolving this with your customer service team multiple times, including speaking with Dasia U., but have not received a satisfactory resolution.