I got an invoice from First Service for $2.17. My payment for Internet Services from Verizon Fios ($90) is automatically deducted from my checking account. There is a link to make online payment in the invoice (clickPay.com/FirstService). When I registered in that site and added the account number (in the invoice), I get a message saying the acount is already linked to another user ( with a different email address which is not mine). This is all very strange. And why can't Southern Walk deduct the whole amount and choose to send an invoice for a balance of $2.17 ?