not taking responsibility

I took my phone back for repairs after using it for a month after I bought it.after a month I got a cal from da store saying they can' fix it due to liquid damage i was told i should pay 1500 for it to be fixed.I refused to pay that money because my phone Neva came to contact with any water.I requested the store to bring back my phone,bt upon its return it had dents on it & when I returned it to the store it didn't have dents.when I asked the store said when they sent it for repairs it had no dents.they called both vodacom & Samsung & the two parties says they received the phone with dents.which means the store damaged my phone before sending it for repairs. Now da area manager says there is nothing she can do.I need my phone back BT without dents because it was still new.i will sue sterns musina because they just keeping my phone in the store & not doing anything.they said I should pay for my phone to be fixed which means it can be fixed.I will take my phone elsewhere for repairs,bt i want my phone the same way it was when i took it back to the store.their area manager is rude & the store is unfair to me as a customer,they are very unproffesional.