The hearing aids are great, but one failed after 2 yrs 6 mths and the other after 2 yrs 10 mths and each time I was given a replacement with a very different battery cover colour from the other hearing aid. This is despite me sending a letter with the 2nd one saying "Please do not dispose of the battery cover - if the aid is replaced I do not want a black battery cover! When my right hearing aid was replaced I was told that battery covers of the colour of mine are no longer available so I would like the current one fitted if a new hearing aid is needed." Why can't Amplifon (a) read a letter sent by a customer with a failed hearing aid; (b) understand that supplying an odd hearing aid is unacceptable; and (c) understand that an item replaced under warranty should match the item it replaces when they are a pair?