VODACOM SELLING FAULTY GREY ITEMS!!!

VODACOM is selling FAULTY GREY APPLE phones, giving APPALLING REPAIR SERVICES trying to cover up and still BILL for when I don't have any handset or service after a telephonic upgrade to platinum account in Nov. After 2 weeks my APPLE iPhone 6s+ kept overheating and eventually died. Vodacom repair centre could not access my account as offline. Instead they run a diagnostic and said the phone wasn't their phone but a GREY ITEM FROM INDIA!! Eventually, their system went on line and they admitted it was theirs. I am a red platinum client and checked the phone in for 7-10 days!! I had APPALLING SERVICE from JASON at platinum desk. 7 days later they returned it to me and had DONE NOTHING!! I had to rebook it with sandton repair and took 5 days to return. 2 hours of having the phone back i find it doesn't even open - its a SECOND HAND REPAIRED PHONE!!<br> I am visually impaired and do not drive - calls have been long and very expensive and taken time and many taxi rides. Does APPLE, MTN, CELLC know their practices? Any ideas how i can sort as their not helping? (I spend 5k+ a month)