How to save a site in which changes will be made?

Question

Data archiving

There was a conflict with one company (foreign). The information on the site was false. I contacted the company but they pretended to be a ficus. I lost about $50
Now they think that they can wipe.
How to collect evidence. I searched in the archive, it says that this page was not archived.
Thank you!

Answer 1

Notarized screenshot