Cheque Guarantee

[Nadia]

Dear all, I am trying to solve the issue with bank cheque issued as bank guarantee under the contract. The cheque was issued in Istanbul in 2010. The counterparty did not fulfill its obligations in full and break down the contract. I am trying to understand how we could collect the guarantee payment. Before visiting Istanbul I would like to collect al preliminary information required under the law to comunicate with the bank. Will be gratefull for any assistance/ advise/ link to the bank.