I wasn't aware of that thanks I was on a prepayed electric meter so didn't have to give last readings and there was no gas.they arnt disputing that I left because I have plenty of proof of that I.e van hire recipet and I started my new job not long after I left but they r saying because they didn't receive the letter I abanded the property and am liable for the rent without the proof of postage

I phoned up my H/A at the start of march to let them know i would like to give notice to leave the property.They informed me that i have to put it in writting.I sent them notice recorded/signed for at the end of march and moved out about 2 weeks later. I heard nothing from them until the 29th of july when i recieved a call asking why i hadnt responded to any letters.I told them that i had left the property and i sent the notice at the end of march unfortunatly i threw away my proof of postage 2 weeks ago and without it they say i am liable for £1404 of unpaid rent. Is there any other way i could obtain the tracking number? as it must be in a computer system somewhere i tried the p/o it was sent from and they have told me they dont keep records and the reciept is the only proof.If i can get the reciept the h/a have said they will be liable.Also the fact it took them so long to contact me and let the arrears build up when they had my contact number on file. Any help or info would be very appreciated as i am getting no where on my own thanks