Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Letter Expansion Pack Not Compatible with Current Fridge Phonics Products

Although advertised as compatible with ALL fridge phonics sets, I was dissapointed to open the expansion pack on my son's birthday and discover that the letters did not fit his fridge phonics word builder or magnetic alphabet set. A call to Leap Frog to try and resolve the problem was unsuccessful. The company does not seem to understand the meaning of the word ALL. They claim that the phonics products I have are new and the expansion pack is old therefore negating the compatibility. The packaging does not list any product age disclaimers. Luckily, Amazon accepted the return easily.