Citibank Credit Card Complaint

Citibank Credit card department,

Transaction issue Michigan

I made an online payment to Citi Bank on the Citi Bank web site. The money was withdrawn from my bank account. Now Citi Bank claims to not have received the payment and has no record of the payment. I called Citi Bank to dispute the payment and I am getting the run around. Citi Bank opened an investigation and than immediately closed the investigation without telling me. I have reopened an investigation with Citi Bank to resolve this issue. I am also contacting my bank from which the payment to Citi Bank was debited ( online my bank shows the Citi Bank payment as having been made ). But Citi Bank is calling up to 4-6 times a day. I have tried to get Citi Bank to note the account that there is a dispute but after speaking to - people ( acct. representative, an acct. supervisor, and a billing representative ) Citi Bank states that they can not guarantee that I will not receive continued collection calls on this disputed payment. I spent over an hour on the phone with these - getting conflicting information from each new person as to how this dispute can be resolved in an expiendient manner.