I have a suspicion that Amazon customer database could or may have been hacked!?

A friend of mine had problems with all the credit cards.
Monies may have been taken or attempted.
Some have now been sorted . But not all.
New cards had to be issued. A lot of phone calls had to be made.
I am given to understand that Amazon helped very little.
I am not sure if clients/members/customers have been warned!
I did not see any mention in the press or
T V.
Readers very very aware and careful. Just in case.
May be, revert to buying from companies web sites or by phone, directly. Not via amazon.
And whatever you do, use only credit card. Not Debit card!!!
You have been advised.