Millions of beneficiaries who use Postbank or gold cards were unable to withdraw their funds from ATMs in December after Postbank uncovered criminal networks targeting ATMs to access accounts. Postbank said: "In recent months, Postbank has been experiencing technical glitches that disrupted the smooth withdrawal of social assistance benefits. "After extensive investigations we uncovered network attacks by criminals determined to commit ATM card fraud-related crimes on Postbank payments using sophisticated modus operandi which require further investigation.