Anthony hired David, a plumber to fixsewer connection leak. David agreed to fix it for $200.0. At the commencement of work Anthony paid David $100 and the balance was to be paid upon completion of work. As David was about to complete the work, Anthony asked David to also fix the tap leak. David said"that would be another $100". After fixing the sewer connection, David tried to fix the tap leak. David could not fix the tap leak completely, as it required new fittings. David removed the tap to temporarily stop the leak. David asked Anthony to buy the fittings for the tap. Anthony paid David $300.00.

Anthony bought the fittings but David did not return. Anthony had to hire a different plumber to complete the tap work who charged him $100.

Is the said contract discharged? Explain clearly

Can Anthony seek a remedy?