Vodacom is being dishonest!

I took my Samsung to the Vodacom Shop in Tyger valley as my soft ware had crashed once again! Three days later I gave them a call as I was unsure what was happening. I was told that it just was a soft ware problem. I was also told that the phone is still under warrantee and the repairs will not cost me a cent. Two days later I received a sms to say the estimate to fix the phone is R1200.00. Outraged, I called again. This time I was told it was \liquid damage". There was no \""liquid damage\"" when I took my phone in! I have heard that when the technicians does not know what is wrong they call it \""liquid damage\"". I have tried to speak to the lady at Customer Service"