Holliday refund

[Guest]

We booked a Holliday with a large Company. We were due to travel the early part of May, come the Virus and I managed to contact the agent we booked with, suggested we consider rebooking with added cost for next year, we then decided to cancel, called the Company all messages straight to voice mail, I have now sent three letters signed for, all received and signed for requesting a full refund within eight days, all ignored, part of the final payment was made on my C/C Bank, advised claim back no problem, but the bulk was on our Debit card, Bank are not able to assist as of yesterday, I now need to claim the payment back, rather than split claim, so please can the team advise the best course of action and the quotes I have to include. Many thanks