poor product & bad customer service

I BOUGHT A BIKE WITH POOR QUALITY BRAKES AND GEARS. BASICALLY YOU NEED TO ADJUST THE BRAKES AT LEAST ONCE A WEEK AS YOU ARE NOT ABLE TO STOP QUICKLY AFTER FEW RIDES. GEARS DOESN'T CHANGE STRAIGHT AWAY AND THE CHAIN IS FALLING FROM THE CHAINRING. WHEN I REPORTED THIS TO CUSTOMER SERVICE THEY SAID THAT IT'S A FAULT OF WRONG ADJUSTMENT AND I NEED TO CALL THEM, SO THEY GUIDE ME HOW TO DO IT. I EXPLAINED THAT I AM CYCLING FOR MANY YEARS NOW AND I NOW HOW TO SET UP THE BIKE AND THAT NOT THE WRONG SET UP IS AN ISSUE, BUT THEY TREATED ME AS SILLY GIRL AND SAID THAT THEIR BIKES ARE GOOD, THAT FOR SURE IT'S A WRONG SET UP AND I NEED TO CALL THEM ( WHAT I WOULD DO IF NOT THEIR LINES HOURS MON-FRI 9PM - 5PM WHEN I AM AT WORK). I DECIDED TO GO TO THE SERVICE TO CHECK IT. THEY SAID THAT I CAN PREPARE MYSELF FOR BUYING NEW PARST LATEST IN FEW WEEKS TIME. I GAVE UP WITH DEALING WITH THIS COMPANY AS ONCE THEY GET THE MONEY THEY DON'T CARE ABOUT THE CUSTOMER ANYMORE. HIGHLY NOT RECOMMENDED SELLER!!!! STAY AWAY FROM THEM.