Why offer a service if you cant perform it?

I went to fill a perscription for anti biotics at the king william’s town branch and left it there to be filled on 2019-01-02 around 15:00 i returned the next day around 15:00 to pick it up only to find the perscription was not filled this is not the first time that this particular store does this as i have problems with my childs chronic medication almost every month