"And as I live in WA and the trash lives in Melbourne it can hardly be my fault. Not impressed at all."
Another told 7NEWS.com.au it was a "security weakness" that Woolworths "direly" needed to address.
He and many others have suggested adding a PIN number at checkout.
In response, a Woolworths spokesman told 7NEWS.com.au it was aware of reports of fraudulent point redemptions in recent weeks and was cracking down on it.
"We've taken the precautionary step of locking down any accounts with suspicious point redemptions while we work with individual members to verify if the activity was legitimate," the spokesman said.
"In all cases to date, the accounts have been accessed with valid login and password details, indicating fraudsters have obtained their login credentials from online scams or other sources.
"We have found no evidence to suggest that our IT systems have been breached or compromised."
It's understood points redeemed fraudulently will be reinstated to members.
This story first appeared on 7NEWS.com.au