Loyal Customer Billing

Hello,

Last June I talked to the loyal customer department, I was told that my bill would remain the same (21.00) for 12 months under the loyal customer program. Since I have auto-pay set-up I didn't bother to check my statements last year or this year until I needed to update my debit card info. My bill changed from $21 to over $80 (I would have never agreed to this, paying this amount is why I left my previous company) in November 2018. It is not fair for me to be told one thing and then get charged a different amount. I've had at&t phone service since 2004, internet with them for over a decade, and DIRECTV for a few years. I do not want to change companies, but if someone can't help me figure out the discrepancy in my months for the last few moths and somehow help me get my money back, then I'll be forced to change to a local company so I can at least get everything is writing. This is so frustrating, I've called and talked to two different reps and they have not been helpful. all they want to discuss is how I can change my service to a new plan.