Illegal Activities

Sergic Qc debited my account several times without my consent !!!
No void cheques and/or approval on our part to give them access.
Tried several times to contact them and leave messages and no return calls or apologies yet ... They only communicate by email and send notice of payments without taking any accountability on their part ...Very unprofessional and to say the least ILLEGAL . They used previous cheque account number to debit our account without our consents.