Transaction processed twice/Refund

I was at Imbizo on the 26/02/2016 and I swiped there once, but got billed twice, I noticed this on my cellphone notification sms the next day and immediately went to the bank to get my statement.I then went back in person with my statement and cellphone sms's and was told i would be called back. No one called and upon me calling I spoke to Patrick Masango who is the accountant and he advised that the money would be refunded to me over this past weekend (05/03/2016). I just got off the phone with him (again me calling them) as I have not been refunded. He now wants me to provide till slips that I do not have and as an establishment he should provide me with.<br> So basically he is saying he will not refund me based on me not having till slips, yet he has my bank statements clearly showing the transactions. I requested a manager and was advised he is not available and they do not know when he will be available.<br> I am extremely disappointed and want my refund as soon as possible.