Terrible customer service

I am currently experiencing really shocking customer service from Hyperli.

I was refunded some vouchers just before Covid and haven't been able to use them till now, and they didn't come with an expiry date on them. When I tried to use them the system said they can't be found. I wrote to Hyperli and was promised a response within 48 hours.

I received an initial response and was advised they would load the credit amount onto my account. I let them know the amount on their request and sent proof. That was two weeks ago. I have not heard back, I've sent another 4 or 5 emails, logged a new ticket, and sent a Facebook message. No response to any of them.

I work in customer service too so I understand there are sometimes delays, but two weeks is unacceptable. My ticket numbers are *** and ***.