Unjustly Banned in Valve CS:GO

I received an unfair ban in CS:GO. I have never used cheats in CS, and I never will; it's against my principles. I suspect the reason for the ban is because my phone number matches with an account that got banned in Overwatch 2133 days ago. That account didn't have a linked phone number, so I attached my own. I don't know how many days later, but a few days after, I found out I was banned. According to Steam, they ban based on phone numbers. How is it possible to ban a recently linked phone number on an account that received a ban over 2133 days ago?