Poor service delivery

Hi,

My new device purchased has been heating up from day 3 of purchase, I have emailed vodacom numerous times since and there has never been contact

When calling the call centre I was told to visit the store for assistance which is inconvenient for me. I have asked for the phone to be picked up and exchanged

To date I have not resolved this, the phone still heats up and it has been effecting my health since where my ears pain if the call is more than 5 seconds

Pls can someone resolve!

Antoinette ***