The nightmare that is the Samsung care centre in Century city

I took my phone in to have its cracked screen replaced on the 17th of November 2017,I was told they would have a specialist assess the damage & I will receive a quotation. They assured me that once I received the quotation and paid for it my phone would be ready for collecollection within a week. On the 23rd of November I received the quotation and paid on the same day. I emailed them back the proof of payment and they responded confirming that they had received it and would proceed to order the parts and fix my phone. After that a week passed without an email for me to retrieve my phone. When I called their line would ring and then just hang up. After trying them multiple times someone answered only to tell me they are waiting for parts, after that throughout December 2017 I would call to enquire about my phone only to have them not answer or when they answer I was told they are still waiting for the parts. I ended up going to the store on the 15th of January 2018 & when I got there and asked about my phone the person in the store said they had not even ordered the parts to fix the phone and that my phone was just sitting there. They had just placed the order and I should have it by the end of the week. I asked the manager how it was possible that my phone had not been repaired and hoe the parts hadn't even been ordered which he could not answer. He passed me on to another woman at the store who assured me that they would get the parts by the 16th of January 2018 and courier it to me by Thursday the 18th of January 2018 yet they still have not fixed the phone and I have not received it.