Disappointed by Rain Internet Service Provider

I received the Rain Sim Card for data, told by delivery that it was already activated, with no further instructions. I tried to use it and it connected once, with very bad connection. The next day it never connected. When I called the first time on the following day to inform them that the sim does not work, I was told the matter will be sent to IT and I would receive an email. I did not receive such an email. I called for the second time, complaining and I was told I would receive an email with settings instructions. I followed all the instructions but the sim card still does not work. It just does not connect to any device even after changing locations. I emailed the service consultant with the issue and requesting that my concern be raised with the relevant department but there has been no communication even when I stated that I refuse to be billed for a service I never used. It is frustrating and very disappointing.