Actually the company that "invented" the cochlear implants are not even in business anymore. If you need service or something, you have to visit a designated third party. There were too many problems with the implants. The original ones were implanted with the tiny remote that turned them on and off (so people could sleep at night without the loud noises) and when you lost the remote.... or it broke... well you guessed it.
The next kind was the type that the implant was a better quality, but needed a stronger battery source and you had to insert a tiny batter pak in your ear drum to power the aid. And since you were already inserting something in your ear..... might as well go with an aid.
CIC styles are so tiny that you can't help to lose them. And when you do, the "replacements" usually tend to be the bigger half shell types. Make sure your current model hasn't been discontinued which is usual about 3 years after they are made. If it is, you insist on getting a style that is like your old one and do NOT agree on the general term "suitable replacement" because all they do is load the hearing profile into a generic ear molded shell. And it won't be able to insert far in your ear like the CIC.
They now have a micro aid that goes behind the ear. I think it is made by Phonak and one other company. It goes behind the ear, but unlike the old ones that look like a slug crawled up your neck, this is about the size of your thumbnail. There is a clear tiny tube that runs into the ear canal with a tiny sound head on it. They are basically invisible. Feedback is also nonexistent as well. Also, they have a 4th setting that is programmable for phone use. Although one of the companies I forget which) is automatic. You simply pick up a phone - any kind - and the magnetic coil in the phone activates the aid when you put the phone up to your ear and the aid draws the sound from the phone through it's digital processor and out the sound head at the bottom.
Sorry for your misfortune, hope they do turn up. One thing someone should always do at some point of time is "lose" their hearing aid. That way your insurance gets you replacements and you still really have the old ones. So if you ever do lose them or they break, you have an alternative ready and don't have to wait a month inbetween.