Galaxy 5, broken again!!

I took out a contract with Telkom and received my new Galaxy 5 Desember of 2014. All went well until people told me they could not hear me. Seeing as I gave my previous smartphone, iphone to a previously disadvantaged person, I have no other cellphone. Off course when getting a new phone one assumes it will be 100%. When asking Telkom to send in the phone for repairs, they told me it would take three weeks. I work for myself and my income is thus dependent on my phone. I explained the situation, but was told that they can do nothing. Now I had to continue screaming like a banshee when talking over the phone as I cannot be without one. Luckily I went overseas end of March for three weeks and gave in my phone before I left. I received it back on Tuesday, tested it and it seemed fine. On Thursday, again people started complaining. So I went back to Telkom again on Friday (today) to ask for a replacement. They said that according to Samsung the phone has to be sent for repairs for the same problem at least twice before they replace it. And what must I do in the meantime while you take three weeks AGAIN Samsung. Talk to my clients on my hand? How is this good service? I will lose income