A hearing aid service system includes a personal communication device (13) acting as a gateway for one or more hearing aids (10, 11) to a remote server (25) accessible via the Internet. The hearing aids (10, 11) have a processor (121) monitoring electrical hearing aid parameters for detecting a change indicating a replacement of a hearing aid component (132; 140), and report the hearing aid component replacement to the remote server (25). The remote server (25) is tracking the consumption of hearing aid components for individual user accounts and identifies a priority item for sale depending on recorded consumption. The priority item for sale is displayed on the hearing aid control application software interface on the personal communication device (13). The remote server (25) completes the transaction based on data stored in the user account. The invention further provides a method for maintenance of a hearing aid.