John Player Cigarettes complaint: not getting a full packet

hi I’ve recently bought 4 packets of a 20 pack of jps players real red separately and every packet I’ve opened have not had the full 20 cigarettes inside the 1st packet of had 15 the second and 3rd packets only had 16 the fourth packet only had 18 cigarettes in the box this not on at all as I’m paying for a 20 packet so I expect to get 20 cigarettes these are not cheap its near £10 a packet plus the packets have 20 printed on the boxes but I’m not getting that amount that’s false advertising in my eyes the shop I’ve bought the cigarettes from and getting good a load of complaints from the public as I have complained to them 4 times now about it because its people like myself are making yous money by buying this brand but yous aren’t being loyal and honest with your customers that’s buying them its just not on at all I would like something to be done about this as I’ve lost out in money wise buying this brand im actually considering changing to a different brand because of this issue !