i have a Mazda 121 s reg low mileage, now it has started using a lot of oil

[Confuzed]

(not leaking) any1 no wot it cud b the problems started the second year when i took it for a service to an unfamiliar garage, they obviously did a crap job and i wont be returning, i had never had any problems wot so ever before anyone have a clue as to wot it cud be???