If you believe that the scale of the charges was not explained to you then you may have been mis-sold the product and you should make a formal complaint to the Insurance Authority in the UAE. You can submit that complaint via their website:
http://www.ia.gov.ae/en/Pages/default.aspx
As the person dealing with your complaint may not speak fluent English I would strongly recommend that you get a professional translation of the complaint into Arabic, and say that you are happy for them to respond in Arabic (i.e. make it easy for them).
Meanwhile, write to Zurich and tell them that you believe that you have been mis-sold the policy. Tell them that pending consideration of your complaint you wish to pause contributions without penalty, then cancel the bank instruction.
Perhaps you would keep the forum posted on how your complaint progresses?