A debtor who does not receive notice of a cession by the creditor to a third party is protected if the debtor continues to deal with the original creditor.
It is well-known that if the debtor pays the original creditor without notice of a cession the debt is discharged.
Principle not limited to payment
Anything done for the benefit of the debtor remains the benefit of the debtor
What is not so well-known is that the principle does not only apply to payment. It applies to any transaction between the original parties such as set-off, settlement, termination by agreement, release, extensions of time and acknowledgements of liability for the purpose of interrupting prescription.
If the debtor carries on dealing with the original creditor (cedent) in good faith, the cessionary (the new creditor) is bound with no notice as if the cedent was still the creditor. Anything done by the cedent for the benefit of the debtor remains the benefit of the debtor.
Refund of price may cancel contract
Incidentally, it was also held in this case that repayment of the purchase price by the seller to the buyer amounted to a cancellation of the sale in the absence of any other explanation.
If you are taking cession of any right, make sure the debtor you acquire receives notice of the cession.