Do credit card companies know your salary?!

I've noticed this happen before, I change jobs, get a better pay package then mysteriously my credit card companies offer me a credit increase. I recently got a significant raise at work, three months later a text "We've written to you offering you a credit limit increase, please read the ... especially about any changes to your income ... " (oh really? What exactly do you want to know that you probably don't already??) Actually no, I don't want or …

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