In XX/XX/2020, I received a text from XXXX stating I had XXXX XXXX on my computer and to telephone the stated # given on the text to learn more. I immediately called the # and was told that I needed to purchase the latest Firewall so these types of incidents would never get thru to my computer. After relating this to my son, he investigated that the company was NOT XXXX, and called them. My son ( XXXX ) was told by the merchant -- XXXX -- that they were a XXXX party and represented XXXX. When my son told XXXX that we wanted to cancel the service, they refused, even going so far as to send Citibank a fraudulent e-mail that I did NOT write. When XXXX saw the e-mail, he immediately recognized the e-mail to be a screenshot and requested the original email. He was informed by XXXX that the email " was original and PAY the {$840.00} that you owe us. '' Citibank accepted the screenshot and closed the case. In XXXX, Citibank reopened the dispute, and now in XXXX, they have declined the dispute and have decided to endorse XXXX. I have proved various documentations of XXXX harassing me and using different telephone #, texting me that I have messages to my phone from a URL in XXXX that has infiltrated to my phone # that I need to respond. Of course, when I dial these # s, they are NO longer in existence. XXXX XXXX is harassing me, and I do NOT want to have anything to do with this scamming merchant. I also have cancelled my credit card with Citibank since I do NOT think they represent their customers and do NOT investigate claims made of fraudulent merchants. I would like to take a claim out against Citibank for not honoring and investigating disputes of their honored customers and also XXXX for fraudulently representing themselves as XXXX and submitting fraudulent e-mails to Citibank.