I canceled my reservation but I needed to reschedule. Will I have to pay again for modem?

I have this issue. This morning I was charged for a modem (I already have one). I just want to activate my Internet plan but I want to get refunded for that amount they took this morning but the new modem (I dont need and I canceled it). Will I be refunded? How should I process just to activate my Internet plan without paying another Modem?
Thank you


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