DHL complaint: Invoicing to the incorrect company

I have in the last three weeks been in contact with the 8 different people who have either not been able to assist me, have blocked my emails or have just not responded.

We originally opened our DHL account on the 18th of February and have since received several DHL packages from Germany almost on a weekly basis.
However, 5 of the packages received were invoiced to a company called “MHE Electronics” and we are Rainbow Forests cc TA MHE Equipment.
I have been struggling for a total of 3 weeks to receive the correct documentation, I have informed everyone that this is time sensitive as we need the correct DHL Invoice.

I came into contact with a DHL employee, who made the effort to contact me and said that she would assist in sending me the correct documentation by close of business on Thursday the 22nd April 2021.
I have received no further contact from her, despite sending emails on a daily basis as a reminder. I requested that the customs documentation, the corrected DHL invoice and the supplier invoice for each of the waybills be put into a separate folder and sent through to me, as I do not work in this industry and if they were all sent together for the 5 different enquiries I would have a hard time trying to piece together which customs docs belong to which DHL invoice etc. As per this employees email, this was promised however once again I am resorting to being shoved from pillar to post trying to get the correct paper work.

Waybill numbers are as follows:
30 8310 2116
41 5448 9953
78 7549 6716
32 4689 1491
44 5102 5073