Double billed for a meal

I visited nandos foodcourt at Southgate on the 28th of MArch 2019. I made a purchase of R222 and my account was billed twice. I received two smses that my money has been debited twice. I told the manager on duty who in the end could not assist me. She then contacted some guy by the name of Themba who is supposed to be the store manager, he was very rude to me. It has been a hassle ever since to get my money returned and I am incurring telephone call charges as a result of this as I am the one to constantly do follow ups. I am very dissapointed in nandos and whether or not I do get my money back, I will never ever buy from you again.