Billing and Payment question

I cancelled my account. On the service agreement, it has the Activation/Deposit Payment Method and it says this:

Payment Method: Cash

Deposit Amount: $0.00
Amount Paid: $75.00
BALANCE DUE: $0.00

At the time of the activation I only had $70 with me and they gave me a chance to pay the $5 until Tuesday. Would they still find out that I still owe them the $5 and report me to a credit bureau? Or they can't do anything about it since it says that I paid it all?

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The $75 non-refundable activation fee does not apply to your bill, it is required up front and there is no way you will have to pay that back. Man, that was pretty dumb on their side if you ask me.