They won't fix my phone which is on warranty

I opened a contract December 27th 2014 with telkom. Then in November 2015 we realized the screen was faulty cause it refused to touch and would go blank for a while until you had to turn the device off for it it function ( iPhone 5s) we then took it to telkom on the 7th of December and handed it in. Around the 14th of January they call me to tell me that my find my phone app is on and they need to login to my iCloud to switch it off so I gave them my pin( changed it few hours later) they turned it off. Then yesterday (26th) I get a call and they giving me a quote of R5000 to fix the phone because it was out of warranty. How Is that possible when I submitted the phone on the 7th? I haven't had a phone in almost 2 months all because of telkom now they refuse to pay or get the phone fixed even though it was on warranty! This is not the first time having a problem with them. Even with our landline we always have to nag and nag for follow ups. This Really is upsetting as they breached their contract they had with me when I opened the phone contract!!