I am also having issues withdrawing Dimcoin from them. They are quite unprofessional and do not respond to support tickets.
I am already in discussion with UK financial lawyers and will be talking with the Financial Conduct Authority (FCA) which is the UK regulator to get them shut down and arrested on financial crime charges.
Below is their legal registration info in the UK. I urge all UK and EU citizens to also contact the FCA as well.
Hit Techs Limited
Kemp House
192 City Road
London, EC1V 2NX
United Kingdom