Telemarketing such a nightmare

I would like to share my dissatisfaction with the Rewards division for Vodacom based in Durban. I was contacted by them to do an upgrade on my contract as I was due for an upgrade and besides the delay in the delivery of the device they also delivered a device which was not according to the specifications I was given. I then notified them regarding the device that they delivered a 32GB RAM device instead of 64GB they then promised to do a refund for me to buy a memory card and sadly to date no action has been done since I emailed as I was advised by Sahana on the 6th of October 2023. What a headache has it become to agree to accept deals via telephone, after this experience I will never ever agree as the service has brought so much strain and inconvenience, worse part is that I am the one who has to follow up all these issues, they just don't bother to follow up an issue on record time .