****med by just bridge consultants

I was offered a loan for 10 000 and the consultant said a sales agent will come and see me to sign the loan agreement,to date no one came. a few days later a guy called and told me to aprrove a Debit check so that they can pay out the following day, I Approved the debit check, I then called to cancel the Debi check since there was no documentation that I signed and no loan payout. They said I must do it in writing, I have sent 2 emails with no response from the company.please help me to cancel this **** from my account