To apply a discount retroactively

[cosmasad]

Good morning friends. Talking to a vendor about switching to a cheaper package, how would you say “… and you will apply the discount retroactively”? It wouldn’t be “θα μου δώσετε το χαμηλοτέρο πάγιο αναδρομικά;”? Would it?

Thank you.

 

[anepipsogos]

-Το χαμηλότερο πάγιο θα ισχύσει (υπολογισθεί) αναδρομικά;