Submit Your Complaint to Citigroup. Get a Reponse via SMS Text. What problem are you having with Citigroup? Select an issue... Poor customer service Interest rate change Harassing phone calls Loan Approval Process Loan Modification Process Miscellaneous Fees Overdraft fees Unauthorized account access Problems with refund None of these match my problem... What happened? Your cell phone number We will only use your number to deliver SMS texts between you and the company. We will not share your number with anyone else. Message and data rates may apply. Depending on your text plan, you may be charged by your carrier. Continue