Find my mobile is a ****

I am beyond disgusted by Samsung's " Find my Mobile " application . My s7 edge was ****** on the 28th of december and i have been trying to track it online at least just to lock it and maybe retrieve calls , but it shows that it is offline and at the same time it changes location the same second which means its not working . I paid R17 000 rands when i bought it counting the cover and screen guard . I'm starting to think Samsung is in cahoots with these ******* because at least i should have the satisfaction of locking my phone but right now the sim has been swapped and the person is online but i can't even lock my phone