ABC Distributing Ripoff Still have not received payment N. Miami Florida

I have only recently started ordering items from ABC catalogue and internet site. I have received all of my items promptly although seperately (a 5 item order will be shipped as 2 items then 3 at outrageous shipping costs) My sister ordered some things on my account. She says she sent a money order on April 21st. ABC says they never got the payment. I just got finished giving them my checking account # on the website to pay for it again. I contacted Customer Service yesterday and they said that they had not gotten payment.

I want to believe my sister sent the payment but can not be certain that is why I paid the invoice. Until I read some of these problems on here I feel I may have misjudged my sister. I dont know what to do. I guess if sister shows proof of her money order then I can sue the h*ll outta ABC for charging me double for a stupid freaking childs swimsuit! If not then I will sue the h*ll outta sister! either way I am getting my money back!

T.L.B.
Meridian, Mississippi
U.S.A.