Bad service...no delivery

Placed order on 18 March. Still no delivery 3 April. I have emailed Zando 3 times to change the address and also phoned Zando twice and everytime they insure me that they will notify the courier about the address change but everytime when I phone Zando again to follow up they still give me the old address when I ask where it will be delivered. Will I receive my goods I paid for and when...I cannot keep on phoning Zando every few days and hold on for 20 min...it is costing me money. I need feedback. Please give your clients updates when you see that an order has been despatched 13 days ago and still not delivered.