Poor Customer service/Business Practices

I have received gift certificates from my husband for several years. Lost the last one. They would not honour the purchase or give partial credit for the purchase, even tho I am a known customer and we provided the purchase receipt. They don't keep records of gift certificates sold except by certificate number and can't cross-reference to a date or name. By disputing a $75 purchase they have lost a loyal customer and hundreds of dollars in future sales from us. Very disappointed in their practices.