LOL dieslgrl!! A BOX on the head. Let me tell you, if someone said stand on my head for the perfect phone connection, I’d try that too! I totally empathize with your situation - and being in sales, you simply gotta get this situation fixed.
I’ve found that the combination of my Marvel aids + Samsung S9 + T-Mobile service on the cell is NOT optimal. I get the same occasional complaints from friends and family that my voice is cutting out or not clear. I blame T-Mobile as much as anything. If you’re making calls from in a warehouse it’s QUITE likely there is signal interference. That is another big problem when I try to take calls inside Costco.
Try getting as close to a “sweet spot” or actually out from the concrete bunker for your calls if you’re tethered to a cell phone. If you need to hear on a landline, I highly recommend you get “Acoustic Phone” set up as a program on your Marvel aids. I just had this done a few days ago and it is a game-changer. I can hear on ANY landline phone - and even better, folks say I come in loud and clear, too. Acoustic Phone sends the audio to BOTH ears - it’s every bit as good as streaming, no kidding!
The downside is that you may get telephone elbow holding the landline receiver up to your ear. Not sure how mobile you have to be in your job, but folks here have also talked about pairing with work phones via dongles or what-have-you. If you are SEATED much of the day, consider using Acoustic phone with your work phone. If you need to move around a lot and require the cell phone, that’s just as good as it gets inside a warehouse.
Keep us posted on your solution.