Did anyone renew from email offer?

Currently paying £53pm, set to rise to £57 in April. Renewal offer was for £58, £62 from April 26. Seems fair to me. Possibly I could get better with haggling, but I can't be bothered so I went to accept the deal.

After agreeing to the terms, ticking the boxes, etc and clicking place order, the webpage didn't change to give me a confirmation order or anything, however I did get pre-contract documents emailed to me.

Tried this 3 times, with different web browsers and it was the same each time.

Account details still show current contract to expire on 31st May. I've not had any further emails since the pre-contract docs came through. The link in the offer email is also now invalid.

Has anyone else accepted one of the offers via email and can confirm this is normal?