Dismal service ethic from Vodacom

Vodacom lures customers to upgrade their contracts and promises them gift vouchers that don't ultimately come to fruition. I upgraded my contract in August 2021 and was promised a voucher of R2 500 which more than two years later I have yet to receive. Once again I upgraded/ renewed my contract in July 2023 and was promised another voucher of R3 500 which I was told I would receive 30 days after that month's debit order run which was 15th September 2023.When I followed up I was told the voucher batch will be sent on the 6th October 2023. When I called today,6th October 2023,I'm told this will only happen on the 31st October 2023. So this thing gets drawn out further and wish I could also enjoy such flexibility. One never gets to speak to someone at Vodacom, when you call,you are sent from pillar to post. I don't understand why an organization like this can adopt such a parochial attitude.