Citibank Mortgage Complaint

Citibank Mortgage department,

Conventional fixed mortgage Loan servicing, payments, escrow account New York

I had a Mortgage with Citi Mortgage with a balance of $230000.00 as of Statement date -/-/2016. At around this exact time I refinanced my house and a Check was mailed out to Citimortgage Inc. for the amount of $230000.00. A refund for the over payment of $1400.00 is due back to me. Several Calls to Citimortgage have been to no avail. They have refused to send me a refund check. It 's been over 60 days since the over payment. Please help me recoup this over payment.