I tried to send a package internationally via DHL. They needed some additional information for customs and gave a deadline for me to provide. After many many emails and twitter messages (I requested a phone call several times but was ignored and tried the customer service number but couldn't get to a real person) they acknowledged that I emailed the information to them on time as can be seen in the timestamp of the email but are claiming that they did not receive it in time. Based on this they returned my package and partially refunded my money. They kept an £8.50 admin fee and refuse to refund it even after many messages and them acknowledging that I provided all required information within the timeframe that was specified. I have used DHL many times in the past and they've been great when nothing goes wrong. This is the first time I've needed customer service and it was absolutely unacceptable. I've sent my parcel via UPS with no issues and will never use DHL again. It's not worth the risk of needing even the most basic competence from their customer service team.