Qualitone Digital

Hello folks,
this is my first post and I need help. I purchased a pair of Qualitone Digital hearing aids in Dec 2004 for 2200 euro. Initially I was quite pleased with them, although I did find it hard to get used to them (3 to 4 weeks). However I now am pretty well disappointed because they have been back to the Agent on at least 4 times for repair (adjustment of receiver, replacement of transmitter ? - I am not familiar with the correct terminology - etc.) Basically the things just stopped working!. I do take care of them and clean them regularly. The right one was last repaired in Nov 2007 and it has stopped working today. Surely I should expect longer service than 14 months. Can anyone advise me on what should I do, or is this normal for these types of hearing aids?