NO CUSTOMER SERVICE

I went to the cresta store in March and purchased a battery, the salesman and the cashier at the time told me that the battery has a One year guarantee, so i bought it. When home charged the battery, battery wasn't taking the charge, when back to the store the next day, they tested it and agreed it was faulty, salesman and cashier was not around, the new cashier says they will whop it for another one, i said i want my money back, they give me another battery, so i asked the replace battery also has a one year guarantee, and the cashier say 6 MONTHS, Please advise how can a customer be told one year on Saturday and on Sunday be told 6 MONTHS, i was told by a so called manager on Sunday that the battery has a 6 months guarantee and the salesman was wrong, but to prove this i must keep coming to the store until i see the young white salesman so that i can question him, and i was told that he works part-time at the store. What a ******* !!!! During that week, i went to the store couldn't fine the salesman or that cashier that sold me the battery, I requested to see the Store branch manager and was told that he was in a meeting and would call me, I am still waiting !!! WHAT A ******* !