Unauthorised Debit order

I signed up with Virgin Active, and I explicitly told the sales representative that I wanted my membership to commence on May 1st, 2024. He seemed rushed, even coming to my house for my signature on the contract. Having worked in sales before, I could sense he was under pressure to meet his targets. Shortly after, his manager contacted me to change my start date, but I stood firm, reiterating my preference for May 1st as it aligned with my budget for April.

Despite this, I received a contract with a start date of May 1st, 2024. To my dismay, this morning I discovered a debit order had already been processed. I promptly contacted the sales representative, who assured me they would credit me for May. However, I declined this offer.

Given their failure to adhere to my requested start date and the negative impact this erroneous debit order could have on my credit rating, I would like to terminate this contract. It's disheartening that my concerns were not listened to, and I hope to resolve this matter swiftly.