You can do a lot yourself: Uninstall or disable all (potential) suspicious, unwanted, unfamiliar extensions (add-ons) from your browser. Check on your programs and apps and remove those that are suspicious. Pay attention to the programs that were installed at around the time that Moviesdimension.com started to show up. It could have come 'piggy-backing[ on another install'.
Run Malwarebytes and Adwcleaner is a good start to begin with.
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