URGENT: Excessive Roaming Charges

Hello,
I am writing to formally dispute an excessive and unconscionable roaming charge of $14,974.99 USD generated by an iPad on my account while in Mexico.
I was never informed that this specific device was ineligible for standard roaming coverage or that it would generate 'pay-as-you-go' charges at such an extreme rate. Most importantly, I did not receive any real-time alerts, SMS, or email warnings notifying me that the data usage had reached these levels.
A charge of nearly $15,000 USD on a consumer account without prior notification or an automatic line suspension for unusual activity is a failure in Xfinity’s billing and notification systems.
I am requesting an immediate investigation and an escalation of this case to the Executive Resolution Team. I am looking for a fair resolution to correct this error. Please note that I am prepared to escalate this matter to the FCC and other regulatory bodies if this is not resolved promptly.
I look forward to your response to handle this via private message.
Thank you."