I have taken a loan from cbq in 2011 and was able...

If a travel ban is imposed because of a bank check case related to a loan, then that case must be closed so that you can travel and the case is closed by paying the value of the check, and if the case is closed, you can request the travel ban To be lifted, and we also quickly close the case to avoid being advised to imprisonment, a fine, or at least one of the two penalties.
The bank must first waive the case until it is closed, and then you can contact the Ministry of Justice in order to lift the travel ban
Here is the text of the Qatari Penal Code, related to your inquiry:
Article 357:
Whoever maliciously commits the following acts:
1. Writing a check, without sufficient funds to cover it face value.
2. Withdrawing all or some of the funds from an account after giving a check in a way that leaves insufficient funds to cover the amount of the check.
3. Ordering the recipient of the check not to exchange or deposit it
4. Intending to write or sign the check in a way that prevents its exchange.
5. Delivering a due cheque knowing that it is uncovered or not exchangeable.
 In any event, the court shall decide upon the request of the concerned, to oblige the offender to pay the value of the cheque and the expenses incurred by the beneficiary;