Poor service from Rewardsco

I upgraded 2 MTN contracts after a call from their sales department. The sales person was good but made a big mistake by capturing a completely wrong delivery address - Welgelegen Germiston. That is or was never my address - I live a Cape Town for more than 50 years. My correct address as per my MTN account is in Cape Town. I phoned Rewardsco back, informed the lady of their mistake and she promised to correct the address. My parcel is still not delivered due to their poor service. Even after another 13 minutes call (at my cost) I am still waiting for any response. I will never trust Rewardsco again.