Wrong contract date end

I am looking for support from other members or ideally a Virgin team member who can help.

I started my 18 month contract in April 2024 due to end in October 2025. I moved house in this period and it seems as I moved house they restarted my 18 month contract from my moving date instead of continuing my initial contract. I also had a promotional offer running from April and this expired in October yet I am still locked into the same contract which is now charging me double as the promotion has expired. 

I should not be in this contract any longer and it is due to run until Feb 2026 meaning I am supposed to pay double for 6 months and I cannot leave early without an early disconnection fee. I have tried to contact live chat and I have raised complaints which were initially responded to until I pointed out they made an admin error and then they just tried to shove a new 2 year contract in my face without reimbursement for the last couple of months.