Citibank Credit Card Complaint

Citibank Credit card department,

Privacy Pennsylvania

I suspect that Citibank from which I have a credit card, shares my credit card transaction data with 3rd party vendors. After shopping with my Citi MasterCard, I see on my - feed advertisements on products and services that are similar to what I just purchased using my credit card. For example, when I bought an indoor TV antenna from -, I saw an ad on - within an hour for a similar TV antenna. Another example is when I bought dishwashing detergent, an ad for dishwashing detergent of another brand popped up on my - feed. In all these and other cases, I used my Citi credit card for the purchases I made. This is very disconcerting because Citi is likely sharing with - or more companies data on my transactions down to the individual item level of my purchases. This is a gross violation of my privacy and I would like to file a complaint against Citibank credit cards.