FTTC Costs vs contract

[#1]

hey all,
Currently on 80/20 FTTC, had been paying £19.99...
Am on a month by month basis as I haven't signed a renewal 18mth agreement...  On old style which is 250gb limit with secret traffic shaping..
Anyway, had the email to say I will charged £22.50 a month I think for the same service from October.....
If I renew for another 18mths, I know I will be put onto the unlimited plan, will traffic shaping disappear, and will the cost stay at £19.99 ?
I have phone with free calls for £11 pm with another provider, so not looking to move my phone line.....

[#2]

Hi there,
I would recommend having a word with our COT team - I realise this hasn't answered any of your specific questions however you'll be able to discuss your needs (and wants) with them and I'm sure you'll be able to arrange a price for the new product you're happy with if you do choose to upgrade