New Inseego Mifi Issue

They credited me the $7 device charge and then the $50 service charge for last month. I explained to them it was not ok to charge for a device that is not working. As of today it still says no service. So they will be crediting me again this month, or they will have a headache on their hands. This is already effecting my ability to work as I need it to work remotely. They take no responsibility for that and I get that they will fight it, but THEY are directly effecting my ability to do business without offering me any solution. I do really hope they have a solution by the 17th. My concern and lack of faith currently is they claim it's all of these devices as it's going to be a software fix, but can not explain why there are devices that are still functioning. My brother-in-law has had no issues with his as of yet. This lack of communication is just ridiculous and grounds for action.