When Is A Guarantee Really A Guarantee ?

Sorry if this has been asked before, but...

If a guarantee is advertised in a sales letter, is this really legally binding ? And if so, what is proof of that the guarantee was offered in the sales letter - saving the original copy perhaps ?

The reason I ask this, is I bought a product that said this on the original sales page I bought from:


"A 100% Money-Back Guarantee
#1!
After you complete this 12 week training course, if you don't feel it was worth
every single penny and more of your under $2,000 investment, I will refund
every give you all your money back with absolutely no strings attached. "

I have requested a refund, they outfit has acknowledge receiving my requests, but will not respond further, and is apparently bawking at honoring this guarantee.

It seems the FTC does have some mention on guarantees, but is a bit fuzzy on what would apply in this situation:

Guarantees and Warrantees
If you want to mention your guarantee in your ad, you must tell consumers how to get all of the details on
that guarantee. Any conditions or limits must also be disclosed in the ad. A complete copy of the
guarantee must be made available to consumers before any sale. This also covers phone, catalog, mail,
and online sales transactions.

The company I dealt with had the guarantee listed in the sales letter which I saved when I purchased the course, but once the course started, they changed the guarantee to 30 days, which does seem a bit contrary to what the FTC has to say about it.

Has anyone dealt with issues like this before ? I would like to get a refund without having to get the credit card company involved, but they seem to not be taking my requests very seriously...

Thanks,

R Mayes