VODACOM *****S LONG STANDING CLIENTS

I am a long-standing (20 years) Vodacom client. I recently upgraded my LTE Data contract (SIM only) online, thinking the new contract (at a much reduced per GB price) would come into effect from the next calendar month. On 1 October 2020, I still received the old data allocation and on querying it, I was told the new contract would only come into effect the following month (1 Nov 2020) Why does it take more than a month to instate an upgrade, when a NEW contract takes 48 hours?? Clearly, they are getting my money already, know I need the extra data and will probably need to top up at the exhorbitant rates one more time. Disappointed!