Worst-service ever by MTN

Bad Customer Service

I bought a phones at MTN and one is ******. I have been calling MTN so many times to blacklist it and till today my cry end into dead ears. Their online customer consultant told me that they are unable to blacklist it as it has to be whitelisted first and that can only be done at their MTN outlet. I went there and I was told that their system is down. I was asked to leave my contact number and they will do it and I never received any call. I went to another outlet and I had to wait for more than an hour and the consultant who called their customer service department was told that they can only do it while talking to me. Imagine, I was in there for long and online customer service consultant still they could not help. On the 5th December I went to another outlet still they insisted that I call their customer service. I called and still they say they direct my query to their manager. I have an insurance and I am running out claiming time-line. Moreover, a ***** somewhere out there is utilizing my phone.