Evri complaint: No Customer Service, requests for call back ignored.

On 21st September I sent a Parcel out, it went to their sorting depot then never moved on, never went out for delivery or anything.
Struggled to get through to a human customer service person but eventually did after both the buyer and I bombarded the A.I Chat and Phone Number. Filed a lost parcel claim October 3rd but it’s been past the 28 days I was supposed to be refunded, not heard anything. Tried the A.I chat 100 times which says someone will call within 24 hours but no one ever does, have requested about 20 times for a call back ASAP but not one Customer Service Person has called me back. Tried e-mailing the e-mail address from the claim form and nothing. No response, no update, nothing. Ebay buyer is irate thanks to Evri losing the tracked Parcel of a Collectors Item and I am Irate because I am not refunding until Evri pays for their incompetent staffs mistake losing the parcel in their Depot. This has been going on over a month since I posted the item. The A.I Chat is useless and getting through to a human Customer Service advisor is a ridiculous. Crap Customer Service.