Disappointing Customer Service

I needed a device unlocked as I am traveling outside of USA. Xfinity would not unlock it until I paid off the balance for the device. I was not told that I would loose the monthly device credit for the device if I pay the balance. After I noticed missing credit, I chatted with Xfinity customer care and I was told that they will refund the credit for the past months to my credit card and credit will apply going forward. When I didn't see the credit for 3 weeks, I contact them again. They said it's taken care and even gave a confirmation number. After not seeing the credit again, I called them. Now they are telling me that as I paid off the device there will be no credit. When I explained that I was given wrong information, a customer service supervisor told me they will take an action on their customer service people who have given me wrong information but they can't do anything to give the credit. I have been a Comcast / Xfinity customer for a very long time. This is a very disappointing customer experience or service. They gave wrong information multiple times. I would like to connect with some one from customer relations department to share this experience. I hope they can fix this so no other customer needs to experience this. I will not continue as a customer