Skechers India — baby shoes

Address:

Thane, Maharashtra, 401107

Have bought 3pair shoes and from it 1pair both sole came out in 3 months and company saying it is not manufacturing defect so i have to file complain against the manufacturer. Have mail them and they said to deposite the shoes at skechers showroom they inspected and revert that it is not a manufavturing defect,
If they are using high quality material How this shoes leaves its sole in a few months??