faulty experia devices

I submitted a complaint on the 12. 021 about a faulty m2 aqua today I had to go to the branch because nothing happened now im told today wait 3 to 5 days to have it collected to make matters worse I took out another contract the M4 aqua for my wife which was delivered on the 11.02 today she switched it on as she was waiting on her sim swap and the phone got burning hot all over back to the branch I go and get put through to numerous people only to be told I would be phoned back.Because they will collect in 3 to 5 day's do they seriously thinlkI want them to collect and wait another week I want this contract cancelled immediately I did not intend to give my wife a faulty device that burns her ear and hands for valentines day but they were quick to deduct money for the courier services for a faulty device so lucky me is sitting with 2 faulty fnb devices and egg on my face for a faulty valentines day gift.All I want is for fnb to cancell the contract on the Experia M4 Aqua with immediate effect as they have caused me enough embarrassment. Disgusted at fnb's service ripping people off by selling defective products :(