is there an alternate number for 08445718972 or what is the company name  for this number ?

Welcome to Sayno. It would help if you gave a bit more information as to what this number is for. If you google it, it seems to be for some kind of phone conferencing system: https://www.intercallonline.com/listNumbersByCode.action?confCode=2645426421

For better or worse, this is more or less a legitimate use for such numbers and there probably won't be an alternative. If you're being asked to use that number to participate in a phone conference then about the best you can do is remind the organisers that there are many other conferencing services that don't require users to pay an extortionate access fee. Starting with Zoom.

Also looking at the link allegro has provided there appears to be a number of alternative numbers listed.

For the UK it also lists the following numbers for InterCall Online:

0808 238 9692
020 3433 3531