Overcharged when Using Click & Collect option - No sign of being reimbursed

Tried out the Click & Collect option, which seemed like a great idea until the money was deducted from my account. The online order came to R664 but Woolthworths deducted R2104.50. They overcharged me for chicken breasts. I obviously called customer services and whoever I spoke to was really friendly and said they would reimburse me but it would take about 2 or 3 days for the money to reflect in my account. After a week, the money was still not in my account so I called again. They told me that they were having trouble transferring the money and I needed to give them different banking details, which I did. Keep in mind, they did not try to get hold of me to let me know they were having trouble, I had to call them! It's been over a month now and I am still waiting for the R1400 to be returned to me.