Certificate for new glazing had not received

Since approximate 5 weeks ago as promised by Lionne Botha that a glazing certification for a new installation of large glass will be delivered to us, particularly to the owner, had not been achieved fully and done as yet. We had paid to them in full amount in advance and yet we have to keep constantly following up with him to ensure the document is posted to the house. Eventually he doesn't bother to co-operate it anymore and become silent. Should I require him a full refund and/or publication for this poor service and/or take them to court for his half service?