paying for goods under warranty

I bought a watch on the 02 .12.2015 and I booked it for repairs on the19.01.2016 and when it came back am told I have to pay R60 because I broke the watch because she assumed I wear it everyday of which I have 3 watches and I change them always and now she is telling me I have to pay it I refuse to pay for something I never broke I have a watch which I bought at NWJ till to date it still in good condition and to my surprise I sent in the watch with it original receipt but she kept asking me if I brought it to the store when the watch was booked which shows *********** funny enough I bought another watch at Sterns still in good condition why will I choose to spoil a watch that I bought with love so all I want is my watch because I did not brake it and please send her to training for customer service because clearly she needs too much training.