CANT HELP WITH EARLY UPGRASDE USE PHONE TO WORK NO PHONE NO WORK

My contract is up fir renew in Jan in 4 months my phone is completely broken and to fix it is over R5000 (almost the price of the phone) i contact retentions team and advise them i need a early upgrade as my phone is my work if i have no phone i dont work whoch means no income coming in, they advised there is nothingthey can do to help me. I have been a client with MTN for many years not missed a payment either and nowe i need help and you not able to do so. I have emailed complaints also no reply suprise suprise on that one. I am disgusted