Vodacom does not want to insure my phone

I bought my phone on the 1st of December 2021 and signed the insurance papers the same day.I went to check why the money was not being deducted last month only to find out that the sales lady did not submit the insurance papers.They are saying we can not insure the phone because it’s late by company rules whereas it was their fault that the phone wasn’t insured and are not willing to assist me in any way