Over charged bill

I’ve been contacting Xfinity for four months since July 7 about the credit I should’ve received on the Xfinity mobile bill. The bill is $76 when I had one line which is only 40 and I was told I had a $17 credit. I already spoke to many people and at this point it’s [Edited: "Language"]. Y’all need to close the account without me having to pay anything. This is very inconvenient on my end, having to speak with so many people and repeating myself all the [Edited: "Language"] time I don’t want to have any questions asked if I answered it in this message. I should’ve received credit because I tried to updating my address so I won’t get charged the extra 25 for not having Xfinity Internet because I currently still do have Xfinity Internet but it’s under someone else’s name and they have multiple lines of Xfinity so I was not able to update my address and they gave credit every other time when I explained my situation and I’ve been waiting for the credit because I already explained to many people and on top of that now there’s an overcharge fee so I need this to go to someone who can actually help I need someone higher up. The line is disconnected. If you know you aren’t going to help send me to someone who can, I don’t need hours wasted again on someone who can’t help.