Ad Astra

I had a loan with Speedy Cash that, after I was laid off, went to a collection agency called Ad Astra. I made payment arrangements with them and have kept them faithfully and they were paid off last week. Surprisingly, I got a call from them today. When I called back, they said they had to call because the last payment had not cleared my account yet. I went online to my bank account and saw the payment cleared about a week ago or so. I told them that but they said the calls would continue until they got confirmation of the payment. What?? I told her I had never missed a payment with them and that I wanted the calls to stop. She reminded me that it was my fault I got into collections in the first place and they were just doing their job. I told her if the calls continued, I would report them to the BBB. She said fine and the calls would not stop until they had confirmation the payment had gone through. Can they do that??????? I realize the debt was mine but, even though unemployed, I never missed a payment to the collection agency. They called relentlessly all through this process to remind me of upcoming payments. It was nt just one reminder call. It was about 4 each time a payment was due. Can they continue to call me??? I thought I was done with this!