Complaint Regarding Delivery Delay For Purchased Item

Dear Sir/Madam,

I am writing to follow up regarding the shipment delay of my purchased mobile phone from your webstore.

The delivery time has already been extended from 20days to 30days!

This has caused a lot of inconvenience at my end as I need to use the mobile phone soon.

What is the corrective action from the supplier ? When will I receive the shipment ? Please state a date rather than an ambiguous answer.

Best Regards,