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If a guarantee against defects on a product has no mentioned time limit, how long must a company honor it? - exchange fax server

I bought a fax number of tapes replacement of approximately 2.5 years. A band in a box with two bands is defective. The tree is broken. The business is not the gearbox with a new one. The "Our Guarantee" in the field has no time limit. Even the box says 100% satisfaction guaranteed or your money back. The seller must honor the warranty now?