When shelly hired the housecleaning service, she asked them to use her hypoallergenic cleaning supplies. instead the workers used their own supplies and shelly had to lose a day from work because of her allergic reaction to the smell of the cleaners. when shelly looked at the service guarantee that the workers had left, she found that she could get a reimbursement for all of her out-of-pocket expenses if she had a notarized letter from her doctor describing her condition and her reaction, an affidavit from the workers that they had used the wrong cleaners and another notarized statement that she would not have become ill if the workers had used the right cleaners. this service guarantee is ineffective because it is not: