Huawei phone repair

I had a terrible experience with Huawei, my P8 Lite doesn't connect to any Wifi devices and the consultant at Huawei established that its the motherboard, which upon taking the phone in for repairs which is under warranty, i had to establish what is happening with the phone after they informed me that the phone will be ready in 2 days..which later turned to 10-14 days not only this delay, no one called or emailed to update me on what is happening , after i had to enquire i was told i needed to pay close to R1000 to repair the phones cover, mind you the problem isn't with the phone cover its with the "motherboard" so how do i pay for a phone that is under warranty?! let alone for repairs on something that isn't the problem. i wasn't willing to pay that amount so i asked for the phone to be returned, to my surprise the phone i took in for repairs now has a damaged screen!!!! Is this how Huawei customers get their phones repaired whilst they are still under warranty?????