Obligated to pay double for my order!!! How is that possible

Good day,

I am so frustrated with the support service from Uber eats. I ordered a meal, R315.60 was deducted from my account instead of R320.60... all Of a sudden, I am told I need to pay R320.60 as there was no money in my account. I sent them proof that the money was deducted but they still telling me to change my payment method and pay double. I’m highly annoyed and frustrated especially since I am a very loyal uber eats customer!!!