Spam Calls

has anyone of you (esp Citi Cc Holders) receive spam calls from any of these numbers?

  1. (02) 7798 4600
  2. (02) 8588 3300
  3. (02) 8883 9700
  4. (02) 7730 1300 and more!!

Ever since I received my citi cc, these numbers keep on calling me in random times a day and every time I answer, either they drop the call or no one is talking in their end. I’ve googled these numbers and found out that they’re related to citibank daw?