[mothered]

tell me something, are they going to investigate with DHL?

They've opened an external Investigation, thereby they'll cross-check the consignment with the carrier's records.

i mean they could deny the refund?

Only If there's Inconsistencies with what you've provided to the rep/agent.

i did everything well, fake sign and both packages of the same order were delivered same driver and same time.

Good, It's exactly how It should be done.

Cs told me this i don't know if incident report is last stage to get refund:

If the Incident report Is approved, a refund/replacement will be Issued.