For an option for Amazon to call back, try this: https://www.amazon.co.uk/gp/help/customer/contact-us?ref_=cu_csp_phone_button&from=gp&source=csp&nodeId=471044&_encoding=UTF8#
Tel:
Amazon indicate and refer to a DHL delivery, but they do not usually use DHL, so you will not find that tracking number that Amazon provides on the DHL site.
Instead they actually use ParcelForce.