False advertising

I have send my watch for battery insert and new belts,They told my mum that it's R995.00 for belt,battery and service I thought I don't have money will budget for it.On the 13th of November I send my mum and the said to her they will send her a quote,on the 27th the send a message saying the watch is fixed n it's R895 for service only but the receipt they gave her says something different They told me I can go to lawyers or we will meet at court plsss help.I will not pay R895 for service ,unless the R895 incls belt n battery then I will pay. The receipt they gave my mum doesn't have a price. Name of Watch:Emporium Job no:R14230