Was this for RIC or BTE Alta Pro, either way it sounds excessive, you could shop around to see if you can get quotes before sending.
This is how the monopoly/cartel work, Phonak are the only company I know that will allow you to send directly to them for repairs, all the others make you send through your local audiology clinic ( middleman )
It’s time consuming and sometimes expensive, you could shop around on eBay for some OPN models, which would be a good upgrade if you want to stick with Oticon.