Advice re getting the best deal please

My 18-month contract ends in May 2024.

I currently have M125 broadband, Mix TV, and Sky Movies. I pay £59pm but a discount is due to end next month so from January-May I will be charged £84pm.

I went on the chat yesterday morning having checked what other deals are around. Sky is currently offering a comparable package including Netflix for £47pm - take off my existing Netflix subscription and it comes down to £40pm.

The lady on the chat finally offered me my current package at £48pm. I said I'd do some more research and come back later. She said that all the details had been saved to my account and would be valid for 7 days.

I went back to chat more later in the day and got through to someone else who claimed they knew nothing about it and there were no notes saved to my account. I went through the whole lengthy process again and he said that the lady had made a mistake. The best deal on offer was £71pm! I called and tried to get through to Retentions and ended up speaking to someone who also offered me £71pm. I don't know if they were in Retentions or not. The problem is allegedly that my contract doesn't end until May and 'special' discounts won't get unlocked until then.

Question: Is it worth trying to pursue a better deal with VM now or will I just have to bite the bullet and pay £25pm more between Jan-May, until these 'special discounts' get unlocked? Also, if it's the former, what's the best number/keypad sequence to use? Getting through to Retentions is a bit like holding a seance, in my experience.

Thanks.