Warranty 1 once?

I read and reread the terms of the guarantee 3 years optional, I only remember the "Important: the guarantee is limited to a single compensation in the form of good purchasing for the duration of the contract." I therefore believe that the items are guaranteed for one single failure in 3 years (option 37.50) because I'm reading, I see nothing that says otherwise. If there are 2 failures in 3 years, how to rule the 2nd failure then? New article of equal value? Refund? Repair section down .... or just? "Importantly, the guarantee is limited to a single compensation"? Am sure after reading the conditions one failure is allowed in 3 years and if I'm wrong, someone to explain more clearly those requirements. Thank you.