Double Charged

When my husband and I purchased a take away I have received a sms from the bank stating that the transaction went through. At that moment Dipuo's till freezes. She made me swipe my card again and stated that the first transaction would be reversed within 48 hours otherwise they will give my money back. I was there on Thursday 26 Nov 2015 and returned on Sunday 29 Nov 2015 as of yet my first transaction was never reversed. I have spoken to the supervisor and according to her I cant count 48 hours as days over the weekend. She wanted me to wait untill Monday 30 Nov 2015 and then if my transaction still was not reversed I must then bring my bank statement. I have proof on my phone of the sms's the bank sent that both transaction went trough not long after one another. Is there no communication there? Why was I promise my money back and when I have returned the supervisor wasn't interested in helping me and had a different story? Its the worst service ever! And you cant tell me they never saw it on their day end that the transaction went through twice! It's outrages and I demand my money back! Just like them I work for my money too!!!