lb. On the 2nd of April, A contracted to deliver 50 m3 of topsoil to B for grading the latter's lawn. In spite of A's telephonic requests, B had not delivered the soil by the 15'h of May, whereupon A purchased the topsoil from C (without notifying B] and had the job finished by the 215' of May. A week later B started to deliver and insisted that A goes through with the bargain. If litigation ensues, what result can be expected