That would definitely be annoying. There is a procedure for taking it apart and fixing that you can find by googling, but I wouldn't recommend it. If you have had the adapter for less than 1 year, you can return it to Best Buy with the receipt and they will repair/replace it for you free of charge. If you don't have your receipt, they may be able to look it up for you. If they can't find it, then call us from the store at 1-800-305-2204 and we'll see if we can get it taken care of for you.

This product is not intended for use with cell phones.

That would be a setting on your phone. The adapter just plugs into your phone. It has no ability to control the volume on your phone. You would need to contact your phone manufacturer and ask them about this.

I would recommend that you bring your item and receipt, back to the place of purchase

If you are still within the warranty period, I would recommend bringing it, along with your purchase receipt, back to the place of purchase to seek replacement options.

Try the Adapter in another cassette player to verify that it is working problem. If the problem persists, please visit the place of purchase with your original receipt to pursue warranty options.