No guarantee of securing an item bought

What makes a binding contract? A binding contract is based in an agreement that is arrived at through a meeting of the minds, most often by offer and acceptance, which is for a lawful purpose, supported by lawful consideration. and in the form, if any, required by law. It is, simply, an agreement that the courts will enforce. I bought an item for R5000 on movingon and paid the R1000 deposit required I was then told that a another buyer had made a better offer of R10000 I was not prepared to pay this and the excuse Movingon use is that a seller can withdraw an item at any time They are covered in their terms and conditions that they are not liable if the seller withdraws an item. Therefore the buyer has no guarantee to secure an item after paying the deposit According to the law this is ******* as the seller did not withdraw the item but was told by the agent they had a better offer. I then tried to test the agent on this matter asking if I could make offers on a few items I missed out on. Obviously this opens a whole can of worms when this is allowed They have so many laws in place for the buyer but it seems the buyer is not protected