Get in touch with customer support and start a ticket:
https://support.ubi.com/en-GB
I wish my stuff was back to square one I could have such a wonderful K/D ratio now with my skill being better now than it was. Not that it matters but for my own personal environment.
Also I tried making a ticket for a statistical wipe, they couldn't do it so I don't think you will get your previous record back as well. Maybe they can swap ours? My KD and Rep is 27 I am 1.00+ with many characters some even 2.0 lol!