"Congratulations! You've won a $2.5 million prize -- after you pay this delivery fee:" Don't do it!

MILWAUKEE (WITI) -- An elderly man became the obsession of con artists. Once one group of scammers ripped him off, he became a magnet for other thieves. So how can you protect your loved ones?

"Got a call one day. The guy was all excited who said 'congratulations,'" Arthur Norrod said.

The caller told Norrod he had just won $2.5 million -- plus $2,000 a week for life!

There was just one requirement: A one-time $1,500 delivery fee.

"He said 'go to Walmart and get three Green Dot money cards and call me back," Norrod said.

The con artists told Norrod to scratch the back of the cards and read them the numbers over the phone.

Just like that, the $1,500 was gone.

Norrod never received a prize.

In fact, he just became more wrapped up on the foreign lottery sweepstakes scam.

"From then on, I started getting calls from other people," Norrod said.

"The scammers are very relentless.. They will call you day and night," U.S. Postal Inspector Brad Mahs said.

Postal inspectors say the thieves often sell each other the phone numbers of victims.

Norrod received calls all day -- practically non-stop.

At one point, scammers told him he had won six separate prizes, and Norrod admits he wanted those prizes to be real.

"My wife being in a nursing home, and being retired -- no money. 81 years old, no chance of a job -- so I wanted the money. It was my personal greed to blame, I`m sure," Norrod said.

Norrod ended up changing his number, but the thieves are relentless.

"They will have a taxi driver come to his house and have him show up with a phone, go to the extent of neighbors, taxi drivers, pizza delivery guy -- anybody they can get ahold of that will go to the house to continue the scam because they think they can still drag something out of him," Mahs said.

In all, Norrod lost $12,000. He took notes of every call and every money transaction.

"I allowed myself to be suckered. Question of old age. I'm not as quick as I used to be. The pressure of medical and other bills, not having money to do what I want, just plain wanting to be rich, I do not analyze facts effectively. I will not admit I am being abused. How do I avoid being bitter with myself?" Norrod said.

No legitimate lottery will ask you for money up front. So if you get a call, a letter, a postcard telling you you have won the lottery and you just have to pay a processing fee -- don't do it!