Modify and correct a few issues with our wordpress site

Description

I’m looking for our WordPress site to be updated and all the plugins updated and a general tidy up. We seem to be getting lots of spam emails and I would like this to be stopped and I would like our service link reenabled. It seems to have a broken link for some reason, and I can provide the diary link up address, so this is very urgent. Not a very big job but would like it to be completed within the next 24 hours and the site will need to be tested.
Home Assist 365 Ltd - https://homeassist365.co.uk/
Boiler Service page with the broken link - https://homeassist365.co.uk/book-your-boiler-service/