Urgently need help please

This is my second stint with rain. Just received my sim card got confirmation that the sim card is activated. Put it on my mifi the light turned green then immediately turned red. As am writing this review it's still red, no internet whatsoever. The same problem is the reason I canceled my sim card previously. I really need assistance with this issue urgently. I thought since there was 5g coverage your service would have improved. I will still recommend your services even though I have had a terrible experience with you guys.