Vauxhall Zafira Oil Sump Problems

Car was serviced December 2010 picked up car and all oil leaked out,had to get roadside recovery (oil sump nut not put on correctly)car was taken back to garage to fix then picked up again and while driving back noticed gearbox slipping wen...

i am using 1 litre of oil a week ihave thick white smoke out of exhaust on start up