Why can't I connect to 3g / LTE ?

I was able to use the 3g / LTE network until December 3rd, but not I cannot connect to either since ( now december 9th ) I tried rebooting my samsung galaxy S5, but still no mobile internet. I cannot see anytning useful on my phone mobile data setting or on my fizz account. I still havent used 1G on a limit of 4G

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