Upgrading?

I missed a few calls from VM so I had a look on my account. My existing contract from April 2025 to October 2026 is M125 BB and phone.

The cost is £29.99 then £34.49 from April 2026 then £65.50 from October 2026.

 There is an online winter sale deal to add Streaming Mixit by adding £5 a month

 and re-contracting. New 24-month plan.

New price £34.99 then from the April 2026 bill £38.99,

from the April 2027 bill £42.99, from the January 2028 bill £75.

I don’t think the TV package gives me much more than my smart TV but the broadband price seems like a good deal. Am I likely to get anything better by threatening to cancel nearer October ?

If I decide to take the deal, is it better to do it online?