Cellphone issue

Am really disappointed at both Woolworths from Sandton and Eastgate malls, I bought a phone on the 4th of April 2025 at Eastgate mall only to find that when I get home it gives me problems, I thought it was a network issue I called Vodacome and I was told the is nothing wrong with the network, I should rather take the phone to a technician or take back back the phone were I bought it. I than called Eastgate mall if I can take the phone to Sandton since I work that side on Monday as they have 7day policy that if they see a technical issue they can refund it or exchange the phone, and I was told I can do that because it’s the same shop. On Monday 7th of April I then went to Sandton mall and explained the situation to them, I was told different stories telling me about the network problem of where I stay, the issue was that whenever I make a call I would speak for seconds then the phone cut’s, same as when being called. I explained that when I exchange the Sim to a different phone I don’t get the same issue. Just to cut a story short am still battling with the same issue, I called Eastgate to inform them about the issue and I was told to go back to Sandton they will assist, when going back to Sandton, they still telling about the Network, one guy by the name of Lungile took me to Vodacom to explain the issue to them, I was advised to get a another Sim, I purchased the Sim, got home am still having the same issue and this is 9th of April 2025. Am so annoyed with how they handling the issue, it’s like am the crazy one, it’s frustrating because am spending money that I don’t have for transportation for the issue they don’t want to take accountability for.