If the invoice in its entirety has been contested, you cannot use this platform and you will need to consult a lawyer to seek recovery through the courts. A judge must then decide whether or not the protest is justified.
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If your customer has protested against a part of the invoice and you have accepted and rectified this by means of a credit note, the non-protested part can be considered as an undisputed invoice. Suppose you have sent an invoice in the amount of 1,500 euros. Following the customer's objections, you agree to reduce the amount to € 1,000 and you send a credit note for € 500. If the customer still does not pay the outstanding balance of € 1,000, you can collect this through Unpaid.be