Some problem with aireplay-ng

I am trying to run deauth command to knock off my mobile from the network using aireplay-ng command.
aireplay-ng is sending deauth packets but the device is still connected. Below is the deauth message details -

Sending 64 directed DeAuth (code 7). STMAC: [device MAC] [ 0|61 ACKs]
Sending 64 directed DeAuth (code 7). STMAC: [device MAC] [ 0|60 ACKs]

Please let me know where I am going wrong.

Are you sending de-auth packets to the entire network or just the mobile device? If entire network then try sending it to the mobile device only. Few solutions you can try - wifi - I couldn't deauth any devices using aireplay-ng command in kali linux - Information Security Stack Exchange