E-Complaint to Post Office for undelivered, stolen or lost packages.
http://ep.gov.pk/complaints.asp
Sender address: China
Sender city - International
For complaints to Senior Management via Email
http://ep.gov.pk/Customer_Care.asp
Always complaint for undelivered packages if they don't come after 30 days. Complaints are very effective. Apart from complaint, also visit Post Office to ask about undelivered packages.
It has been observed, that undelivered parcels are kept by Post Office and delivered ONLY after complaint. If no complaint is made, they keep it for themselves.
Lots of frauds are going on related to undelivered packages and if it keeps happening like that, AliExpress will stop shipping to Pakistan eventually.