I recently disconnected my phone and paid an ETF of $100. Looking at my final bill, I see that there are several charges making the total bill $117.08. How can I be charged sales tax and surcharges for cancelling the service? See below:

Fed Universal Service Charge $4.30

Gross Receipts Surchg $3.18

*** State Sales Tax-Telecom $4.39

*** Cnty Sales Tax-Telecom $5.21

Thanks in advance.