Poor customer service (Edgar’s brits mall)

I bought a phone in Edgar’s brits mall on the 8th of sep 2020 and they told me that if the phone gives me problems before 7 days I can bring it back for exchange On the 14 sep 2020 i went back to the store as the phone was giving me problems They refused to exchange it They said they are going to send it back to their suppliers so that it can be checked if it really has a problem I went back to the store after a month and 2 weeks to check if my phone was back, When I get to the store the lady that was assisting me (Idah)gave me a number said I must call their suppliers and communicate with them And when I call them on the 14th of nov they told me that the phone is still in the store the phone was not collected the collection was delayed for what reason I don’t know and they are going to send someone to collect it I mean after the whole 2 month I am so disappointed in Edgar’s and their phone suppliers,what a poor service I’ve ever received