Where was the summons served?
How was it served?
Was it served differently to the warrant/s?
Was the summons posted to an address? Then why was'nt the alleged warrant ,that you have no knowledge of, sent via the same method? it must have blown away or they dint serve one
google the plannings policy on service of warrants, if they cant prove it was served in person or to a "last known" address, then it is un served and ineffective
Then acknowledge the summons and state that your defense is "that you have no knowledge of any warrant and its service and put the claimant to strict proof of their claim"
Are you living on the land?