AnyVan review: Beware - severe misconduct and false advertising/quotes

As soon as I paid the booking fee, the rep disappeared, my questions via the messaging platform went unanswered, my "point of contact" never contacted me or answered the phone or responded to messages, and when I finally got through to the office, an exceptionally rude staff member said that my point of contact won't speak to me as he doesn't like speaking to customers.
I booked based on specified dates, made it clear my move was set in stone, and was told the dates were definite. But once I'd booked, the mover said the dates were now up in the air and they'd only give me around 4 days'(!) notice of when my international move would be!
I was promised full support with customs and a bespoke packing quote. Neither were provided. I was also quoted £75k insurance cover, but after they initially held off from providing the terms, it emerged that the real insurance was a fraction of this. And the mover was advertised as having 100% positive feedback, but after I booked, a large number of negative reviews came to light which pre-dated my booking and appear to have been previously suppressed or hidden. Even now, they get removed for "review" by Anyvan.
Following all this, of course I cancelled. Anyvan advertised that I could cancel any time up to 2 days before the move, with no liability and a full refund of anything paid, and I cancelled 15 days before. But Anyvan refused a refund, now claiming that their advertised policy is incorrect and it's actually all non-refundable. This was never stated at any point prior - I was only ever told it was fully cancellable and refundable. I'm now having to go through the chargeback process via my bank to get the money they owe me.