IPhone 6 making calls on its own to numbers thats are not on my contacts?

I have an iPhone 6 and family sharing on it with my boyfriend because we have an apple music account together. Today a number called me, a number that I didn't have saved, and I asked my boyfriend to look it up on his phone and the number was saved to his contacts. I called the number back and the person said that I had called them earlier, the crazy part was that I hadn't, my number even showed up on the persons call log but I had no record or the call on my log. How could this have happened?

Are you sure, you are just taking the word of a stranger for it?

I'm having the same issue! Was this ever answered?

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