I challenged the CS the terms wasn't read out to me when they offer me, so the terms are technically invalid. Secondly, if it is valid, they can alter the package which is MOP158 or MOP188 but they can't move user to other package as and when they like. Keep on lodge complaint right after they responded to your previous complaint. Later can go for CFM, SKMM and tribunal court for maxis to breach their contract.