"VOTT'S UPPEN, KLAUS???" joke

Background: A firm in Germany ordered macaroni from a firm in the United
States. While the macaroni was enroute, a couple of boxes
broke open and some rats nested in the macaroni. The German
firm sent the following letter concerning the condition of
the macaroni.
WILHELMSTRASSEE 135
HAMBURG, GERMANY
BRITISH ZONE
SCHENTLEMENS:
DER LAST TWO PACKESCHES VE GOT FROM YOU OF MACARONI WAS MITT RATTSCHIDT
GEMIXT. DER MACARONI MAY BE GUT ENUFF, BUT DER RATTCURDS SCHPOILS DER
TRADE. VE DID NOT SEE DER RATTCURDS IN DER SEMBLES VICH YOU SENT US
FOR EXAMINASHUM.
VE ORDER DER KLEEN MACARONI AND YOU SHIPT SCHIDT MIT DER MACARONI, IT VAS
A MISTAKE, YA? ID TAKES SO MUCH TIME TO PIK DER RATTCURDS FROM DER
MACARONI VE LIKE YOU TO SCHIP US DER MACARONI IN VUN SAK UND DER RATTSCHIDT
IN DER ODDER SAK, DEN VE MIX IT TO SUIT DER CUSTOMER.
PLEASE WRITE IF VE SHULDT SHIPP DER SCHIDT BAK UND KEEPEN DER MACARONI, OR
VE SHULDT KEEP DER SCHIDT UND SCHIPP DER MACARONI BAK OR SCHIPP DER WHOLE
SCHIDDEN VORKS BAK.
VE VANT TO DO RITE IN DIS MADDER, BUT VE DUNT LIK DISS RATTSCHIDT BUSINESS.
MIT MUCH REAPAKIS,