Return of faulty product

On 12 November I purchased a screen protector which the service agent put onto the phone. Shortly after leaving the store it started to lift off the screen, and as the store was already closed, I returned early the next morning. They told me it cannot be replaced and refunded, this is MTN policy and they can also not return to the manufacturer for assessment etc, this would be my job. <br> I was none to pleased, and raised this with MTN through the call centre. Part of the response I received was:<br> \We apologize for the delayed response. Kindly be advised to visit the MTN store where you were assistance."I rep**** that this was not sufficient information as the same store had refused to speak to me - both the store manager and supervisor on duty were at the store and not helping. I requested further information such as who should I speak to at the store"