Yes, you can. Do elaborate about your problem so that it is easier for us to discover the defect (The more details, the better).
Eg. If you say that you are facing connectivity issues, don't forget to tell us the devices you have used your wireless in-ear with. We will try connecting it with multiple devices to find our whether it has a compatibility issue or manufacturing defect.

In certain cases where the defect can be obscure, we will send the product to the brand for re-inspection. Each and every brand knows their product the best and they will be able to provide the best resolution.