MUST I SCREAM /SHOUT TO BE HEARD-VERY POOR SERVICE

I BOUGHT A PHONE ( NOKIA ASHA) AT TRUWORTHS ABOUT 4 AND A HALF OR 5 MONTHS BACK. I HAD THE PHONE FOR PROBABLY A MONTH, THAN IT STARTED GIVING PROBLEMS. THE PHONE DID NOT CHARGE AND COMPLETELY DIED. I TOOK THE PHONE BACK TO TRUWORTHS , TO HAVE THE PROBLEM LOOKED INTO AS THE PHONE WAS STILL RELATIVELY NEW. NEEDLESS TO SAY AFTER ALL THE BACK AND FORTH TO TRUWORTHS, ADVISING ME THAT THE PHONE HAS NOT BEEN RETURNED, DUE TO MTN BEING ON STRIKE. 3 AND A HALF MONTHS LATER AFTER NO COMMUNICATION FROM MTN OR TRUWORTHS THE PHONE IS STILL NOT FIXED. ACCORDING TO THE LADY AT TRUWORTHS MTN ADVISED THAT THE PHONE HAD LIQUID DAMAGE, THAT WAS THE REASON FOR THE PHONE NOT BEING RETURNED. IN ALL THE 3 MONTHS THERE WAS NO COMMUNICATION WHATSOEVER. HOW DO YOU TELL 4 DIFFERENT PEOPLE WHO WENT TO TRUWORTHS BEDFORD , ALL WITH CELLPHONE PROBLEMS, THAT THE ISSUE IS LIQUID DAMAGE. I KNOW FOR A FACT THAT THIS WAS NOT THE CASE. HOW DO YOU COME TO THE CONCLUSION THAT INDEED THE PHONE IS LIQUID DAMAGED WHEN YOU DO NOT OPEN IT TO CHECK, ADVISED TO PAY R330 FOR MTN TO OPEN THE PHONE, BUT I AM NOT GUARANTEED THAT IT WILL BE REPAIRED. REALLY??? OVERLOOKED BAD SERVICE ONE TOO MANY TIMES. IN THE END ITS COSTLY