electrical issues

hi i got a soda superb at start of year and had problems with 12v not charging although seemed to run perfect , but got it to garage for checking and explained i had flickering headlights , heated seats were just lukewarm and they told me it failed the battery test and replaced battery , fast forward to last week and on every start up is told me 12v low drive to charge so booked into auto electrician and got it back friday morning with a new alternator fitted ,

drove from edinburgh to siloth yesterday morning all was perfect , coming home partly in the dark daughter kept asking me to turn on my headlights but they were on ! i struggled , got out the appeared to be on but dim and flickering / pulsing don't ever drive in the dark usually as dont like it anymore i'm stumped as what is going on , and regens are frequent for few weeks also now and done a 300 mile round trip no issue to pull into my street at midnight and it start a regen i don't know what to do anymore