POOR DECISION MAKING ON MANAGER AND POOR CUSTOMER SERVICE

I bought a new Stylo phone for my business, but found out the speaker is not clear my clients keep talking and I keep asking them to repeat. I took it back and instead they repairer gave me the new phone. It did the same problem and I took it back again, again was issued the new phone. I requested the lady at the shop to authorize me to take another type of a phone seeing stylo has a speaker problem, the lady told me to call the company on the repair slip. I told her I am not going to open it and I called the company as told they told me the store should authorize that not them. I went back to the shop wherein I spoke to lady who said is the manager I explained what the company said she later said their help desk say if I took it and bring it back the 2nd time they will refund but the phone I was bring I already brought it back twice and the shop knows it but they couldn't overrule their help desk I asked the number for their help desk which they said they are not allowed to give to customers, I asked her to speak to them on their store line to explain I am using the phone for business purpose and I cant spend 200 petrol for 1 complain every-time as I am not residing next to them. I then left the phone with the shop manager Chantell and wrote my reason of leaving it there. They must just accept that the cellphone came out with factory fault coz I am not the 1st my niece use it and her mom always complain of poor communication, so for me I cant persevere that because my income depends on it. I just need PEP store to refund me or allow me to buy another model not the stylo type maybe Nokia and sumsung as I never had a problem with it. I saw it affordable and helpful as it carried 2 sim cards BUT I am back to zero now I dont know if I will ever get my money back of=r not. The cellphone I left it on the 11/09/2019 still sealed.