What can be done about this

In Missouri: I have a credit card debt from 1976 with no legal proceedings; only collection calls & letters to my home.
Recently, I received a call from a man representing himself as FedEx and they were having problems delivering a package. He asked what hours I worked and asked if the package could be delivered to my place of employment.
I gave the address and phone number.
After no package was delivered, I called FedEx and there is no package.
However, I have received a collection letter at work.
Who has the bigger complaint here: the collection agency, my employer, FedEx or me?
Are agencies able to do that?

That should have read "1996" not 1976.

[JETX]

1) The use of a 'pretext' to get your contact information (even work) is not illegal. So, no claim against anyone for this 'tactic'.

2) However, the Statutes of Limitations for Missouri is:
Sale of Goods: 4 years
Open Acct.: 5 years
Written Contract: 10 years

So, if the statute 'clock' in fact started as you presume (in 1996), the debt would be unenforcable unless it derived from a written contract.

Thank you, Halket.

In Missouri
As a follow-up to this question:
What about Section 807 of the Fair Debt Collection Practices Act?
It states in part, “A debt collector may not use any false, deceptive or misleading representation or means in connection with the collection of any debt.”
Wouldn’t telling me they represented FedEx, when they didn’t, be false, misleading AND deceptive?

Also, the last call came from Vancouver, Canada.
Are they using this to “get around” the law and can they do that?

I need to give this one last shot.
If anyone has an opinion, please post it.
Thanks!

I have to say the first thing I would do is contact this collection agency and tell them that you are going to let FedEx know that some sleazy collection agency is using their good name to contact people. While this collection company may not be concerned about some little nobody(no offense) I am sure they would not appreciate the heat of a giant like FedEx. Also, if you are interested, I have a two page letter that stops most collection agencies in their tracks. It is legal and not at all "shady" It works great. I have not received a phone call from a collection agency in months, in fact I have received two letters of apology from their attorneys!

Please post it.