How to waive roaming charges that we didn't ask for it

<span;>Hi, I have been charged with international roaming fee of $2000. I can't afford to pay that insane amount. I only received the messages when I am landed back to US.

Our family has 5lines of Xfinity mobile. The charges is based on my daughter's line. She was using wifi-hot spot and wifi during vacation at Thailand. Looks like xfinity roaming is running behind although we are using public wifi .

We didn't ask Xfinity that we will use their service, we didnt give approval that we will use roaming service. We were with her all the time. She didn't get any messages regarding to roaming fee update<span;>. The other family members were not using Xfinity mobile line at that time. So, we didn't get any mesaage at that time.

Pls help to suggest how to waive that fee? We were trying to reach out Xfinity support via chat and calls. No one can tell how to appeal for this case. Thanks. </span;></span;></span;>