No 30GB data as promised by MTN during upgrade

I upgraded on 13 August 2018 and received a new Samsung S9 Plus. Part of MTN's promise when upgrading is 30GB data for a 30 day period. I have not yet received the promised data. I phoned the call centre on 3 occassions and the matter was "escalated". I also sent a complaint via e-mail. Up to now the 30GB data is still outstanding.