Xfinity credit promised but not received

Xfinity agreed to credit us $1,740 . I have called and gone into the Xfinity store to have them upload a screenshot of Xfinity agreeing to the amount and credit months ago. I need the credit applied asap and a call to [Edited: "Personal Information"]

service address [Edited: "Personal Information"]. Name on account is [Edited: "Personal Information"]