So some context on the matter.

I recently bought something on Shopee and the price listed was RM100 which was a fraction of the actual price. I then proceeded to request COD service, because 1, it was just RM100, so keeping cash ready was not an issue. AND 2, I was out of the office without my cards (as a principle I do not save my card details in Shopee because it enables me to spend even more because of the convenience). And you may ask why not use bank transfer instead, I wanted to lock in the price as soon as possible and my area's internet is a bit slow.

I then reached out to the seller who assured me it was an original item and that I should not be worried. I then went about my day and when I reached back home at 2300, I was scrolling my Shopee when an idea hit me. If the seller was selling this item at such a low price, why not check his profile to see what other bargains I could scoop up. Upon getting on the seller's page, I was gutted, they only had 1 item for sale, the item to which I had already bought, I shrugged and was about to leave the page when something caught my eye. The seller had edited the price to RM1000 instead. My heart dropped.

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Now I am worried about 2 things.

1. My Shopee screen still shows that it is COD for RM100. I already told the receiver, that he will need to pay RM100 for the package which I will then reimburse him when I do go back there. Now if Shopee would to chase for RM1000, it is going to be an issue and a humiliating scene for the receiver who is a student.
2. I am also afraid that the seller will purposely lapse the send by date just so that he can charge the new price which I think was unfair because firstly, he did not inform me the price had changed, and secondly, when I spoke to him, the link and price was shown in the chat. Nothing was said about any error.

So basically what I am asking here is if there is any sifu-sifu that has encountered this and what to do next? My main questions are:

1. If just say the seller purposely lapse the send by date so that the order cancels, can I demand the same price from the seller assuming the item is still available?
2. If the Shopee COD is approved for RM100, they cannot come around and demand RM1000 right?
3. Is there any law in Malaysia that states that the seller needs to honor the original price as that is what we had agree upon?
4. Do I have any grounds to at least request a reduced price of say RM750?

I have reached out to Shopee Chat agents, but they were no help. They kept repeating that this is between the seller and the buyer. I asked if there was any stipulation in the Shopee rules that protects consumers and they gave me the party line of needing 14 working days to get back to me.