please don't call my number any more please

the caller was looking for my ex husband and told me he put my number on the account as an additional number. we have been divorced for almost 20 years, i want to know how they got my number.
Been trying to call the number to get information where my ex husband gave my number up, so i can ask them to remove it as i do not want them to phone me for his unpaid accounts, and to give them his correct contact details and email as I was able to trace it on Google and found out he has his own company now, so he can pay his own damn accounts.

I called the number back and reached ARA call center.