Closed me account without reason, prices triple

I am so angry. We send a parcel +-once a month to overseas via DHL Express. Suddenly I could not login -> Apparently my account was closed. No one could give me a reason why. I am told to fill in some forms so they can reopen. These stupid forms and docs took me hours to fill in and gather. The account is opened and now the prices are suddenly triple the amount. I am offered that they can close that account - this is the only reply to my grievances. Unfortunately I can not use the account with the new prices. IF you want to increase prices, then just do it, dont make me fill in a million stupid forms and gather docs only for me to find out after that prices will be triple. We are small business trying survive this economic hardship, dont waste our time. Typical evil corporate