Upgrade

I have been a client at cell c for about 12-14 years. now with this upgrade I must hear that because my payments get received between the 2-4 of each month (via EFT) the will not honer my upgrade as they now only accept payments before the 30th of each month . and been a contractor that is not always possible to funds available on the 30th sometimes my account is paid in advance it has happened that the account gets paid late but that is few and far between