Poor deceiving customer service

I took my Samsung A53 that is still under warranty in for repairs in Newton Park 5 weeks ago. I was advised it will be ready within 3 days , after a week I went in to check on it and was advised that they have ordered a Part and are waiting for it. After a week I was called a several times to send through proof of purchase which I did. They called me again to tell me that my phone has been tampered with and some number is not matching I need to pay R4000. I refused to pay that amount because I knew very well that my phone is under warranty and I am within my rights to get it repaired by Samsung. I was advised to come pick up my device at a different Samsung TT3 store in Walmer becoz they have closed the Newton Park branch. Upon picking up my phone I'm told I need to pay R280. I've been up and down with Samsung travelling for 30km and been in communication with Samsung and yet received deceiving information and all they want is money yet my phone which is still under warranty is not fixed. I'm disgusted with such inconvenience and poor service from Samsung.