I need to fix my bill

I just want to pay just $80 can't pay more than that

See the following Apple articles:

Add money to your Apple Account balance

Add money to your Apple Account balance - Apple Support

Add a payment method to your Apple ID

Add a payment method to your Apple ID – Apple Support (UK)

Payment methods you can use with your Apple ID

Payment methods you can use with your Apple ID – Apple Support (UK)

fyi: Not all credit & debit cards seem to work with App Store / iTunes Store, try a different one, or preferably a credit card. If your card is not accepted as a paymenf method, you need to contact your bank.

See also -> Apple Media Services Terms and Conditions

Legal - Apple Media Services - Apple