Ultratech Cement — Bad quality Cement

Address:

Sainthia , birbhum,731234

I used Ultratech Premium Cement for my slab concreting. after de-shuttering, found water moisture at bottom of slab. then I called service engineer, he said tis nothing, this is weather moisture. After 8 month, now I clean of my roof top, some long crack are found & water leakage start .

I do not understand, now what i am doing.