TopCV Did not receive my product, amateur offering, and appalling customer service

I ordered a cv writing service for $349gbp from this company after a very convincing sales pitch - topcv.com
I received a first draft few days later and found the service was entirely unsatisfactory and nothing like their sales, it was worse than the CV I sent them. I wrote back with my feedback requesting a refund (even negotiating to go down to the cheapest service) and they refused, saying that they don’t do refunds and it’s stated on their website, and kept offering me another writer.

However I’m not confident in their service anymore and would like a refund. Furthermore I don’t want to spend hours explaining about my industry and experience to an unqualified copywriter. That’s why I paid them in the first place to save time updating the cv myself. To date I’ve emailed them back and forth, they threatened me with collections, and offered a call with me but never called.

Finally I called and the manager wasn’t available at the time. I wrote one final email stating that I don’t want another writer and my consumer rights to a refund. They responded that they are well within their legal rights to not offer me a refund, and that if I decided to collaborate with them again they will re-open my case, which does not address my concerns at all as a customer, and one who has paid a ridiculous amount for a service that's not been delivered.