Terrible customer service Huawei Melrose Arch.

i possess a Huawei Mate 10 Pro which is still under warranty. I had specifically chosen to buy this phone for its IP67 water resistant properties. Im a medical doctor, and our phones do get contaminated with hazardous secretions like blood, bodily fluids etc, from time to time. so being able to clean it with water is really important.i had cleaned it multiple times under a running tap without it giving me any problems. On the 19 May 2019, i had to leave this phone at the Huawei Store in Melrose Arch for repairs. It had a faulty charging port which was quickly fixed and the phone was returned to me in good working condition. This changed when i had to clean it again on the 17/09/2019. I once again only placed under a running tap and dried it thereafter. this was the first time i had to clean it since the charging port repair. About 1 hour later, the phone screen went blank. the problem did not resolve overnight and i took it back to Huawei Melrose Arch for an assessment and repair. i was notified that my phone has water damage and was quoted a repair fee of around R5000. i contested this because the phone is still under warranty, with excellent exterior integrity and should not have water damage due to its specifications. the only and ONLY possible explanation for the water damage is that the phone wasn't adequately sealed after initial repairs.i don't have the name of the sales representative who helped me that day, however he told me that he will escalate the matter to the managers and i should get feedback within 3 to 7 working days. I didn't get any feedback and was forced to drive back to the store on the 25/09/2019 as their landlines just ring and never answered. I spoke to Anna who is the assistant manager there. She told me the matter hadn't been escalated to her, but she will personally attend to the matter and come back to me by Friday 27/09. Once again i received no feedback and was forced again to go in to the store on Friday at 17h40. Anna reported that she as well forgot to escalate the matter and apologises for that. She then proceeded to call the manager Hloni, to come and attend to my issue. Hloni displaced the most unprofessional conduct and refused to speak with me while literally standing in front of me. He proceeded to say to Anna loudly in front of me, 'if the phone has water damage, then it has water damage. what must he do about it'. He then walked out of the store. This is absolutely terrible customer service from Huawei Melrose Arch and my phone is still in their possession with no further progress of how it's going to be fixed. I'm greatly disappointed and upset about the conduct they have displayed towards me. I'd like to please get feedback as this matter has been dragging longer then expected. Regards Liso