My complaint still not resolved by Standard Bank even after a week of trying to resolve it.

I had a case where i needed to be refunded money back, 3500, I was only refunded R2499, service request ***. They have been promising to get back to me, it has now been a week. How can it take a company a week to get back to someone. I am truly disappointed , and I feel the unfair treatment towards me still continues. However I still need the rest of my money, even if my account once went into arrears, that is no reason for me to be treated this way. Previous complaint, no one is dealing with it.