My Drone sold because they say its my fault they don't open Sundays

So I had my drone that was expiring on the 20th of July, and as custom I called them to extend it by a few days. I spoke to Lebetse at the buyers after the person using the Cash Crusaders WhatsApp says they can't help me with the extension. Lebetse said he can assist with the extension until the 25th of July which at that time I didn't know it was a Sunday. So as usual whenever the expiry day is on Sunday or Public Holiday (If they are closed) I knew that it automatcally falls to the next day or Monday in this case. So Yesterday Cash Crusaders Kempton Park was not open, so because I had a emergency breakdown at work in Mpulanga, I though I said someone to go pay today, but to my surprise when he got there he was told the drone was sold this morning. I called to speak to Lebetse he told me it was sold because I did not pay yesterday. I then spoke to the manager who said he was Justin and he said that their system unfortunately continue to count Sunday even If they are closed. So he basically was saying it is my problem that they were not open on Sunday, and it is my problem that when his staff gave me a new expiry date they didn't tell me that it would expire on that Sunday whether they are closed or not. Lebetse said to me that if something expires on Sunday they consider that it expired on Saturday since they are not open Sundays. If you look into my ID number you'll see how much I've traded with Cash Crusaders... in Secunda, Middelburg, Witbank, East London and now Kempton Park, so over 50k -80k, so how come all of the branches I've dealt with operate the same was except this one? The worst thing is that on the day I pawned my drone Lebetse insisted I fly it inside the store even though I told him it was not safe, as my fear happen it went up and crashed into a TV next to it and cracked one of my propellers, I didn't pay attention to it because I was running late with where I needed the money for. Secondly he asked if I could give him my backpack which i used to bring in the drone, he said it would make my drone safe and I didn't mind. But today Cash Crusader Kempton Park sells my drone and says it is my fault they were not open Sunday.