bad service

i took back 3 watches on 17 june ...1 for strap changes 1 for battery and 1 for cleaning the watch glass ...all 3 watches purchased at american swiss ...the assitants tells me they going to send it away for quotes ...no1 got back to me with quotations for the repairs i went back after 2 weeks to find out its R70 each the strap 1 didnt come back yet ...i told the assistant no1 phoned me to say its ready ....the 1 watch had scratches on the glass which i wasnt happy with she told me they going to fix it for free ...they phoned me to say the watch is ready only to hear they dont have stock of the glass and the strap 1 they dont have that strap ...so why does 1 purchase from them only to find out theres no stock and up until today no1 phoned to say they have stock to fix my glass they scratched ...