Money scam ? Distraction scam ?

i’ve been at tesco for pushing 5 months and today i encountered what i think is a money scam where they lay out all the money and you count it they count it and its correct but when i started putting the money into the machine under the till (they were trying to distract me here ) i realised that this is not £700 worth of money i my hands right now but by then i had already put £100 into the machine and recounted the money and there was only £300 in my hand i immediately called a manager and explained but she couldn’t really understand the situation and just started shouting at me infront of all the customers saying why didn’t i count it but i did count it . the part i think i messed was when i accidentally processed the transaction as if they paid for it. The manager ended up getting the correct amount from them But then after the shift she said that u could get sacked for this and i wouldn’t be out on tills again and told me to slot the remaining money (which she got from the people trying to scam me so my till wouldn’t be down ) into the machine. And before this i already had a meeting because my till was up £20 because the manager told me to continue using a till where the machine where u put money into wasn’t working because £20 was stuck in there. Will i get sacked for this

Edit : I was nearly in tears when speaking to the manager after the shift.