All perfect praise be to Allah the Lord of the Worlds. May His peace and blessings be upon our Prophet Mohammad and upon all his family and companions.
A debtor is obliged to accelerate the repayment of debt and clear him/herself from the liability for people`s rights in order not to be labelled as an oppressor. This is attested to by the following narration in which Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (PBUH) said: "The Delay in payment by a rich man is injustice." [Al-Bukhari and Muslim].
When the repayment date is due, the trader/debtor is required to make payment according to the price agreed upon on the day the sale transaction was concluded. In fact, the debtor is liable for the price of the products and not the objects themselves since the sale contract had already been concluded, but the price was deferred. Therefore, the debtor isn`t required to pay the value of the products after it has changed. Rather, he is required to pay the price agreed on upon concluding the sale contract.
However, it is better for both parties to sit together in order to arrive at an acceptable solution. In this regard, Allah the Exalted Says (What means): "such settlement is best; " {An-Nisa`, 128}. And Allah The Almighty Knows Best.