Our_man_in_Havana

Had my 09 Octy 2 since summer 2021. Alarm unlock chirps never worked, never thought anything about it tbh. Started with low battery warning about 6-8 months ago. VAG specialist disagnosed as alarm siren dead and draining the battery as will trigger hazards when the vehicle is left locked. Have found hazards going regularly when parked up on the drive. Ongoing workaround has been to disconnect the battery. Have installed a new aftermarket siren from Aliexpress but still suffering with the same issues. No unlock chirps and battery drain continues. ATA definitely switched on via dash options. Could this be a wiring issue relating to the alarm? Please help! Thanks in advance for any ideas or suggestions.