No se reciben llamadas y los mensajes de textos se demoran

I've called 611 MULTIPLE times regarding this issue and I've not had any resolution. Maybe someone at T-Mobile will see this and help. I can go all day without receiving a single text. And then, late at night, when I'm peacefully sleeping, I get woken up with a bombardment of texts. We're talking 20-30 plus, all at once. That's not a pleasant way to wake up btw. The other two lines on our account don't seem to be affected by this issue. I have a substantial amount of business conducted through text. I'm having to resort to Facebook to communicate. That's absolutely unacceptable. I spoke with one representative at T-Mobile (specifically out of the Birmingham, AL office, she said) who actually told me that I "might want to change carriers before the end of the month to avoid being charged for that month." I actually asked her to repeat that. I said "so you're not even going to try to get me to stay, your just going to give me advice on how to leave?" She responded, "but you'll owe $1700 in device fees since you leaving early". Absolutely TERRIBLE customer service. I called back later and got someone from somewhere else. She sent a replacement device, under warranty and waived the fees. (great customer service, she actually tried to troubleshoot some and was very friendly and polite) I'd say this is great, but I've already done this step before. I'm on the second device, with the exact same issue. I'm seriously wanting to keep my device and T-Mobile, but I can't keep having this issue. I'm attaching a screen shot of the text dump tonight, notice the sent times and when I got them. Please help me figure this out.....

I keep texting myself to try to see some sort of pattern or at least narrow it down for the tech support (I've got an extensive background in electronics myself, I'm not new to this, but I can't do anything on their end) Thanks for any input in advance.