Quoted for repairs on phone still in warranty

1st September I handed in my galaxy S4 for repairs at the Samsung Care center in constantia park for a cracked screen and it didn't pick up my sim. 25 days left on my warranty. After more than a month that it was in for repairs, depleting my warranty, they phone me to collect my phone. It still didn't read my sim.<br> <br> I took it back the same day and was told that I would need to do a sim swap for the phone to pick up my sim. After paying for a sim swap I found that the phone still doesn't pick up the sim. (Costing me time and money)<br> <br> I took it back a week later as I only had time then and they booked it in again. Last Friday I received an email for a quote of R 3,142.13. After a long discussion it was clear that the staff would not help me and I was told that the quote stands.<br> <br> They didn't fix all my initial issues with the phone. Took a month to repair the screen (depleting my warranty) and now refuse to fix my phone unless I accept the quote.<br> <br> My phone should still be under warranty of repairs but they simply refuse to fix it.