Really bad Home Internet- Anyone who can help on how to return?

I was cajoled into trying one, with promises of easy return. T-mobile has really bad signal at my house but I was hoping that 5G might be better. It wasn't. The only way it worked is if the T-mobile personal cell spot (or whatever) was connected to my Spectrum internet. That way I could tell that it worked and could provide signal to phones etc. Without that, forget it. 2.6 Mbps down, 0.03 up. The other day Spectrum went down and I tried it again. It was not perceivably better than nothing.

So I call 611 to get a return label. I've accumulated a couple of hours on hold. You are promised an expert, and everyone claims to be an expert, but they cannot help at all. You need to be passed to a Technical Expert in the Home Internet department, for a shipping label. They transfer you, but no one answers or returns calls. Eventually I was told the queue is 3 to 4 hours. 

That tells you there are massive problems with this product.

If I only had a signal, I might have liked it. It has several SSIDs, maybe a Guest network, and separate (if you want) 2.4 and 5 GHz, none of which I get from the Spectrum equipment.

But the terrible support, even before I wanted to return it, really makes me re-think T-Mobile.