Poor customer service and no honesty

I ordered my rain simcard on the 21st of December 2018. They delivered on the 4th of January 2019. Since the delivery I have been having problems connecting to the internet. Contacted rain, they then saw that the wrong simcard was activated on my account. Since then I could not connect to the internet but they still want to charge me, as I can see on my dashboard of my account that there is someone in Magalies connecting to the sim linked to my account. I am not getting any answers out of them.