[mothered]

Reading through their policies would help.

You need to know what you're up against, hence this Is the first port of call with every SE.

Preparation Is paramount.

I find that the website policies are quite vague. It says if I don't receive the package I've to contact them within 5 days

It depends the nature and magnitude of the site.

I've read polices that are more detailed than The Declaration of Independence (so to speak). Read every detail In their terms.

[DragonicRek]

as @mothered has stated, make sure to study their polices.
Formulate your SE around it