Anyone have GW contact info for Chase, Macy's, Capital one, Credit one bank?

Also, anyone have GW on Santander? I have 4- 30 day late payments from 2008-2009 but this was when HSBC still owned the account... I have no idea if I should contact HSBC or Santander (who now owns the account, and I have been paying on time for the past 2, almost 3 years).