SAMSUNG NOT returning my phone after paying for it to be fixed

On the 21 of February i paid for phone repairs to my phone at the SAMSUNG repair center that used to be at Century City Cape town. till this day i have not received my phone back. instead when i went to where the repair center was i found a notice on the wall saying the center had moved somewhere else. this was the first time i got to know about this even though these people had in their possession and item of mine i was never informed of the change in location. i then went to the new address to inquire re the status of my phone where i was then informed SAMSUNG had collected all phones from the repair center and are now in their possession, of this i was also not informed. this all happened around the 5th of April. All this takes place after i was informed it would only take 2 weeks for my phone to be returned. on the 24th of April i made my first contact with SAMSUNG where by the lady on the phone informed me she would call me back to inform me of when i can expect to receive my phone back by the following day, i just needed to send her an email with some information that she required which i sent immediately after speaking to her, with no such call ever being made. 2nd of May i sent a follow up email and was informed 'Kindly note that Nikita is still busy with your complaint and she will call you with feedback.' up to this day i still havent had anything from SAMSUNG about my phone and this is a service i paid for.