Upgrading speed on existing service with Vodafone TV (old type)

My present service is as follows: Fibre 200 (connected in mid-2015 so possibly an older product with a different marketing name), old Vodafone TV with Sky, voice service

I want to upgrade the speed to FibreMax and keep the rest. Inquiries to Vodafone claim that I can't do this and keep the old Vodafone TV box, it must be replaced by a new one. The reason given is because the billing system associated with FibreMax is different to the current system being used with Fibre200 and only physical Sky or the new Vodafone TV is loaded into the FibreMax system as options.

Am I right to think that this smells a bit off? To me this looks like an attempt to move me to a new product that I don't want just to get one thing that I do. TV over IP is great but the new Vodafone TV is a completely different product.

Incidentally, I rarely use the record function on the existing Vodafone TV box but appreciate the freedom I have with regards to what I record and how long I keep it.

Other than being tied to the Vodafone router for voice service I have had virtually nil issues with the overall service.