I wrote to my landlord and gave notice (due to the timing of my new tenancy I was too late for that month so gave 6 weeks notice and paid rent on both properties). I took the keys into the shop they own and she denied receiving my notice. She said that they had moved but had never given me their forwarding address or a new contact number. I know the letting agent contacted them about my new tenancy as there was a delay and it was vaguely stressful waiting.
Where do I stand legally? I have no proof of posting but surely i did the right thing and the change of address if not my fault.
Thanks.