Medicaid + HMO?

I recently moved back to America with my family. We didn’t have health insurance, so we got on Medicaid. After 1 month on Medicaid, I got a job and got insurance through them. I wrote an email to social services to cancel my insurance, as I didn’t need it anymore (I know I probably should have called, but I work 8-5 and their hours are 9-4:30 so it’s very hard to call them). I thought it was all cancelled because I couldn’t log in to my Medicaid account anymore, and just went on my way.

Now, over 6 months later, I have learned that the accounts are still active. We have been using my employee insurance, so I thought maybe nothing will happen and it’ll cancel on its own.

Well, my daughter recently had a doctor’s visit and the bill, after my employee insurance, was around $68. But, they then ran it through Medicaid, which paid the rest. Am I going to have to pay that back at tax time? Is there a problem having both at one time? I received a letter saying we no longer qualify for Medicaid and it will be discontinued as of July 1st. I also received a letter that both my daughters had been approved to continue Medicaid (even though it said they too were going to be discontinued. Confusing!)

I’m worried I will get into trouble or owe lots of money due to this. Is this something I need to worry about? What will happen from this? Thanks in advance.