Poor service from Hyperli

I have been trying to cancel my vouchers for the past couple of months, there is no response from Hyperli and I keep getting an error message that i need to ad my contact details, and those details are already on the system.

I need a refund of all expired vouchers that I couldnt cancel due to Hyperli systems being uncooperative.

This is contrary to treating customers failrly and I deserve better service.