Bad quality goods for sale

I am a first time customer. Takealot sold me the same faulty product 2 times in a row on the same order number H96 mini TV box. The first time it took almost 3 weeks for a replacement just to get a faulty product the second time round. Now again I have returned the same faulty product and they are refusing to replace it because of a missing battery cover which probably costs R5. They expect me to forfeit R1000 for bad quality goods they sold me. I originally asked for the 3rd replacements where they could take the battery cover from my 3rd replacement which they refuse to do due to policies, what about your policies of the constant sale of faulty products, what about customer service. In that case please give me a full refund for your faulty product and deduct a reasonable amount for the this battery cover.