Problems , 1 ) steering lock engages and car will not start
2 ) Bluetooth not working
3 ) central locking erratic
cause Battery fault or charging fault , fit correct battery
Remedy
start stop battery's are expensive , trouble is, go on line find battery for model no or on reg does not always give you the correct battery spec , check with dealer for advice on that one .
What has worked for me re steering lock is disconnect battery for 5 minutes ,re connect and put a mobile booster on for at least 10 minutes , worked 4 times for me so far.
After doing above the blue tooth works for a short while so short term easy fixes can recommend small battery pack until such time I can replace battery .