Seagate harddrive 3 tb

In December 2016, i bought a 3tb seagate harddrive from game in boksburg. In july 2017 it just stopped working. I took it back to game in august 2017 and asked if they could save my data that is on the harddrive. They said i must take it to a computer shop where the people might be able to save my data. Aftr a few weeks they called and said they couldnt save anything on the harddrive. On 16 December 2017 we took the harddrive back to game in boksburg. They booked it in with the cables and all in one piece. But on the repair slip it only said used and in box. The 23 January 2018 game boksburg phoned me and said i must go and collect the harddrive. We got there only to find that the harddrive was in two pieces and it was put back in the case backwards. I did not hand it in like that. The lady who opened the box phoned someone and they came there to the front and when we asked him why it was like that he said i booked it in like that. We told him that it is not true and he said we booked it in like that. He walked away and i asked the lady where the cables was and she said there was no cables i booked it in without cables. I told her i had the cables in the box, but she phoned the lady who booked the harddrive in and the lady said there was no cables. I asked to see the video of that day (16 december 2017 at around 10:00 - 10:15). Everybody saw the video exept us and they said she didnt even open the box. My question is how can you book something in without looking at it. Taking it out of the box. And how can you say there was no cables if according to the people who looked at the video said she didnt even open the box. Today i received a phonecall again from game in boksburg saying that they cant see what is wrong with the harddrive if they dont have the cables. I told them again that i booked the cables in with the harddrive on 16 december 2017 and they said i must go and look through my house if the cables are not here. I just want to know what i can do from here. They messed up big time and they are making me out to be the bad one. Is there someone that can please look into this? My phone number is ********** 800 and my name is Lesinda Potgieter. Thank you