Extremely poor service

Waybill no.: ********** 945 Envelope with documents sent on 14 January 2019, delivered to a bank on 16 January 2019 @ 06.35 (I don't know of any bank that is open at this time of the day). Signature on proof of delivery is "Stamp". On 29 January I requested a name/signature/bank stamp of the person that signed for the parcel. After numerous calls and e-mails most of which have not been answered I lodged a claim by e-mail on 14 February and followed up on 20 February 2019. Needless to say DHL have not responded. DHL of all companies should know that when one uses a courier service one expects prompt delivery and be provided with appropriate proof of delivery when requested to do so. It is disappointing that DHL have not dealt with my request for appropriate proof of delivery or claim despite many call and e-mails. I sent the documents again on 18 February and because the matter above has not been finalised, I had to pay again.