Poor quality

I bought one set of bras,and one single black black last month in mall of Africa .all along the black one was fine until this morning, the elastics are coming out;one side torn;it not even a momth having it,last year i bought slippers within a week they were torn,also bought walkmates sandles for my son,within a month they were wild open from the front..i thought it boy cos they can be rough,but now im concern with the quality,the price i paid for all of things things is way too much.