I recently purchased Cellular HAT Kit LTE/4G. I set it up, but according to your website it says that if I use the SIxfab SIM it would be completely free. Within the last 1 hour my credit has gone from $25 to $4.86. How could I make it so I don’t have to pay like your website says? According to your website, “The Sixfab CORE is free forever. There is no additional fee as long as you use Sixfab SIM connectivity.” Please let me know how to keep my connectivity free.