Hi All,
I thought I'd update where I got to...I eventually got put through to the home moving team via chat who understood the issue (the original agent just confirmed I was going to get a massive increase on the account). They gave me this explanation:
"when we transfer you services, we actually file a form called "Contract Suppression" that contract suppression is where this will notify our Back office team to suppress your contract and match it the same at your old address. However, due to many request our Backoffice team may have missed some request hence the reason why contract has been resets. When this happens, we instead check the registered Discount on the account to verify the actual contract length, once confirmed we'll have our supervisor on the account and they'll amend the account contract as well."
He was logging me a ticket for his manager to adjust the contract end date and raised a complaint - so hopefully this resolves itself this month.
Thanks!