Samsung Poor Customer Service

Before i start if i could give Zero star i would have. Took my device to MM ALL Service centre in Johannesburg. The device had a software issue. Left it for repair and when i went to go pick it up it had developed another problem. Device was No longer secure, engineer Mpho told me this was normal after a software update. Found it hard to believe. Left them to resolve this and after a few days went back into store. Device was still the same and this time the IMEI number was now different from my original device. Spoke to the manager in Store and he was No help. He told me i had purchased a **** device from O2 UK. I was lost for words. I left the device and escalated the matter to Samsung head office. Things got even worse. Manager YUGEN KISTADU was very unhelpful. It was a waste of time.Yugen is now ignoring my emails and calls as well. Samsung refuse to be responsible for this blaming me. They had the device all along and it developed problem after problem. I have been trying to find Samsung CEOs details or even Samsung Africa's contact details. You escalate a matter and it is dealt with in this manner. The store still have my device and refuse to repair it or fix it. Yugen as a Manager of complaints should be ashamed of the way you deal with complaints. Samsung South Africa should look into more detail about the way these managers deal with complaints. That is a very expensive device and i will be taking this matter even further.