Brits Markham bad service

On the 1 December 2020 I bought a phone Huawei Y5 lite at Brits Markham store.i was told that the phone guarantee is 1 year. On the 4th Dec 2020 the phone started acting up.. The screen was blurry and going up and down. I took the phone back to the store as I was told that if the phone gives me problems I must return it. On my return to the store i was told that they will be sending my phone for repair and it will take a month. I got an advice from Markhams in Mabopane that as it was not yet 7 days of purchasing the phone I am entitled for a new phone or full refund. I returned to Brits Markhams and requested fora manager I received a bad service the manager by the name of Leah refused to help me and refused to write an email to the customer service she said their store emails hae been blocked and they cannot send out emails. This is a bad service how am I supposed to stay the whole month without a phone that I have purchased and not on credit I paid full amount. I want a refund I don't want that phone anymore.