Now only you know Shopee CS are all just using canned responses.

The CS can't handle anything else outside of their standard daily situations and let the cases hanging there until you give up or send them a legal letter.

Your mistake was cancelling after 2 or 3 days thinking that the loophole of not providing any pick up deets would allow you to cancel. Alot of buyers think buying online is different than dealing offline, so they can cancel silly nilly.

FYI based on the policy

If the seller does not receive your pick-up details within three (3) calendar days after you have placed the order(s), the order(s) will be automatically canceled and refunded to you.

This means if the seller does not receive any pick up details, it's his or her discretion to cancel the order and it's not up to you as buyer to cancel.

You using chatgpt doesn't mean anything because the policy is between the seller, shoppee and you and in their eyes you placed the order,you waited for days after confirm buying and decided to pull out. That fault lies with you lah.