Freight companies and Customs Compliance

Though I know this doesn't apply to all freight forwarders and clearing agents but why are so many still getting import declarations and export declarations to customs wrong - even when they have been given clear instructions. What can we do about it? HM Revenue & Customs and the Export Control Organisation expect exporters and importers to control their freight companies - you given them written instructions with key information: EORI (VAT Number), Customs Procedure Code (CPC), commodity code (tariff number), export licence number, customs authorisation numbers, eg for IPR, OPR, Warehousing, etc. The import or export customs declaration comes back from the freight forwarder (if you are lucky) and one or most of the details are wrong. Perhaps with the increase in AEO approved companies this problem will fade but it seems that training for both companies exporting from the UK and companies importing into the EU is essential. In the meantime customs compliance takes up a lot of time in our office - instructing, checking, double checking, chasing forms, reporting errors and chasing amendments. Any comments?