Faulty phone with no response for over a month now

The first time I went there was on the 15th May at about 15:00. I was assisted by Simphiwe,they assessed the phone and told me to come back. I then took my phone back. Went back on the 19th at about 12:00. Assessed the phone again and they realised the phone was operating well and the problem is the charging system was faulty. They didn't book it still as I took it back with me. I then went back on the 27th at around 16:00,on that day simphiwe was busy with other store details and asked his colleague to assist me. His name is sphiri. He left me waiting on the counter and went to the toilet. When he came back, I told him that it wasn't a way to treat a customer and that I will report him. That guy gave me a stinking attitude and even offered me a phone to call the head office. I was so ****ed off. But kept my cool. Went back on the 28th. This time they took my phone.. I've been sending emails to them and they told me the phone was still in store. If they don't have spare parts they should just refund me or a new phone instead of them treating me this way. I paid cash to buy the phone and I deserve that much if they still want me be a customer there