Go to the Google Ads Help Center (https://support.google.com/google-ads/gethelp?visit_id=636876555278368483-3256381338&hl=en&rd=2) and fill out the Contact Us form, or you may also call Google Adwords Support direct.
For members residing in the United States, the toll free numbers are 1-866-246-6453 and 1-855-607-0431. Support is open from 9:00 am - 8:00 pm EST Monday – Friday.
For those residing outside of the United States, there will be a Chat option in the link above and you can ask for direct contact numbers from there.
You can also fill out an Appeal Form here and follow it up by calling this number - 1-844-252-8611 (same hours of operation as above).
Note that there are other members who have experienced account suspensions but were able to reactivate just by following the above. We are 100% positive that they will reactivate your account once they hear your side of the story.