Bad attitude no follow up!

On Sat 13.01.2018 I called to cancel my existing contracts and was assisted by Nathan. He talked us into upgrading instead. He was not knowledgeable when it came to the plans available or prices on the phones. We spoke about the Iphone 8 on the 250 pinnacle but when I asked him about the Iphone 8 plus he said it was R400 more per month and not worth it. I only looked at CellC current specials after the call then called back because I found that it was only R100 more! After several attempts I got hold of Nathan who sounded very furious with me. He was very rude! I was assisted then my the manager on duty named Kerry who promised that a manager will call me but i never received any call since. Kerry was very helpful but was not able to resolve my issue as the wrong handset was delivered yesterday. Cellc wants me to be responsible for delivery charges when they have given me incorrect information!!