Credit Services Company took possession of my medi...

Credit Services Company took possession of my medical bills (post-insurance coverages) that I was either not made aware of, or fell between the cracks.
I was able to work with them to find a manageable payment plan.
Having very limited experience working with collection services, I kept my guard up as expected.
That stated, they have been easy to deal with as I have been making monthly payments.
Yesterday, while scheduling a monthly payment via the online portal, I mistakenly did not change the "payment amount" to reflect our agreed upon payment. Instead it populated for the remaining balance ($2,600.00!). One month before Christmas, this would have been devastating to our gifting ability.
The payment went through and I once again was on-guard as I rushed to call them to see if there is any way that they could help me out on this overpayment.
The card cleared, they received authorization and approval info so in reality, they had my money-payment in full.
I spoke with a guy as he relayed the information to his supervisor. He assured me that I would see the funds returned to my account the next day, thus allowing me to be able to go back in and schedule the agreed upon payment amount.

To my surprise, I checked bank information (check card) and the funds reversed back into my account!
I am glad to report that Credit Services Company did what they said they were going to do, period.

As previously stated, I have very little experience working with collection services. I am well- aware of the horror stories/reputation that this industry has gotten (sometimes well-deserved I am sure) but I will tell you that being upfront with Credit Services Company and working with them on a solution has worked to my advantage.
At the end of the day, it is MY debt that they are attempting to collect.