Could be from a woman who is smitten with your husband.
I had that problem start in 1986 when I began attending a new church.
Late evening calls and the caller hung up after I answered.
A month later began dating one of the women in the church and the calls stopped.
Relationship ended when I moved to a new job a couple hundred miles away.
The problem is that nobody seems to want to speak up to a collections agency. Yes, this is to collect a debt, but I won't go through that agency because of the condescending way they handle their calls. I've taken calls before and there is no reason to be this way, for this reason I'm settling my debt through the company in which I ran it.
These people keep calling my place of business. I mentioned this is my place of business, and it's illegal for them to call me here, but they continue to call. I know why they are calling, and I'm making payments. This harassment needs to STOP!!! I'm not hiding from them, so they need to leave me alone. I'm on the no call list.