I do set up auto payment when I am sure the bill will be stable, this was while I was still in the introduction rate and I wanted to be aware of when the price

I do set up auto payment when I am sure the bill will be stable, this was while I was still in the introduction rate and I wanted to be aware of when the price change hit. Now the question is, since they messed up what should be a simple accounting transaction, do I trust their billing system to have unfettered access to take funds from my bank :)