Defect in Appliance

I am disappointed with this brand,I buy everything Samsung,phone,fridge,TV but the experience I just received with the microwave I bought at Game-Richardsbay,within 2 months the TouchPad was not working and when I returned it to the store,I was later inform that they was moist inside TouchPad and the Samsung technician has fixed it,when I specifically told them I want a refund since I can't keep a microwave that is giving me problem in just 2/3m months after buying it, how does moist get inside the TouchPad if there was no defect, this was 3 or more weeks ago and I'm still without a microwave.