Scammed over the weekend, why do they prey on old folks??

HI
We have IYogi computer protection which has served us very good, even got a crashed computer working. Any how IYOgi called to tell us we needed some software update, this would take 2.5-3.5 hours.(THis was on Sat). I was working at JoAnns at the time. My Dh gave the ok, I got home walked the dog and still IYogi doing computer.
So I called IYogi and it was NOT IYOGI!!! They do NOT make phone calls! So now we are stopping some of the credit cards, that dh used on this transaction with fake IYogi and the shoes I bought with a card. We dont buy items on the computer.
Just now got a phone call from my dd bank that a purchase was being made in TX. DD/Jean is Quantico,, VA and I live in KC area.
So pray, it's upsetting changed our password on the computer, dh called western union and may have to call police.
Pray all will slow down as we don't use computer for paying bills or taxes, plus the computer is new since 6/11. So that is good, but I hate this happening to Jean who uses her own lap top, not ours, oh I had to check her account yesterday for her to make sure she got the money in so that is how. Very annoying that there are people out there and prey on people who are old, dh in 60's and me 50's.
Oh well God is good and in control.
PTL bank called us and closed the account. Pray as they will mail new card quickly to us & I will have to mail it snail mail to Jean. Pray that it will get there when she needs it.
Thank you all for reading this and your prayers!!