Breach of Contract

<p>I bought a bed and a master guard spray from best home and electric Daveyton branch on a 6 months payment contract about 2 months ago , They only delivered the bed and not the spray , Even though I finished paying off the account in 2 months I still don't have the spray , I went to the shop several times complaining about this and theyu kept saying they will come spray the bed but nothing happend ever since, I do not want the spray anymore but I want a refund on my money together with the interests paid , please assist in this regard because all they do is lie and I've had it with this , I want my money back.</p>