I am in search of a good service for sending large files. I tried to use Dropbox and they have non existing customer service, so I want something I can rely on.
Customer service is a rare and precious thing these days. Dropbox and similar services are priced based on minimal-to-no personal service -- it's a "do it yourself, you can figure it out" approach, to keep prices down in an incredibly competitive market.
That said, there may be higher-priced file-sharing outfits that provide a better amount of customer service. I don't know of one offhand, but other FReepers may be able to chime in.
If nobody responds on this thread, consider creating a vanity thread yourself with the question, and address a comment to let Swordmaker, ThunderSleeps, and me know about it so we can ping our respective Ping Lists for you.