Can I cancel an agreed payment?

by Sam
(Texas)

I have been getting calls from a debt collector for a couple of weeks. I finally called back, not really understanding who they were at the time and then realized who they were. I set up a date at the end of this month to have $230 taken out of my account and just thought I would have to come up with the money before then. I didn't know I could negotiate until I searched the internet. I would like to call back and cancel the date all together, knowing that I don't have to make a committment.

I can just do it on my own time. Is this possible? Will they cancel the date I have agreed for them to take money out of my bank account? If not, would I be able to call back and arrange payments instead of the full amount coming out at once as it is planned? Today is the 15th of Feb, and the full amount is set to come out on the 27th of Feb.