Random Roam Charge

My wife just got hit with a roaming charge of around $12 on her bill.
We haven’t gone anywhere and been home.
In fact we’ve actually never even been on a vacation or leave the country…
So she called Bell and they said she sent a single text on May 6.
She checked her text messages and there’s no messages sent on that entire day.
Then Bell said check May 29. Nothing.
Then June 1. Nothing.
Then I asked why is he asking to check different dates now when we were told initially it was a single text on May 6.
He couldn’t give me a clear answer.
He also couldn’t tell us what number the text was sent to….
He said he can’t waive the charge.
What kind of BS is this…
She’s never had roaming on and never left the country, let alone the city.
We don’t live near a border.
Like common Bell.