<human>: So, when I cancelled my Comcast cable service (because I was moving and don't need cable anymore), I had $122 outstanding, aka my final bill. This amount, weeks later, was sent to a collections department that Comcast uses. I thought it was a bit odd, because it wasn't very delinquent, but as I understand, Comcast tends to do this with disconnected accounts.

Anyway, I logged onto Comcast's website and paid the $122.30 I owed. All seemed to be squared up, but then I received a letter from the collections dept saying thanks for your $129.80 payment (the original amount plus a $7.50 fee). 

Both amounts were taken out of my checking account, so I disputed the latter, because I did not authorize that payment. My credit union, upon investigating the dispute, credited me the $129.80 while they work it out. That still hasn't been completed, but today, I received a check from Comcast for the original amount I paid, $122.80.

Can I cash this check?

Can you give me the gist of the text in a nutshell?
<bot>: Was disputing a double charge on a Comcast account... bank is disputing the collector and issued credit, and Comcast also issued me a refund.