Car trouble O/T

So daughter bought a second hand car in December and has no end of troubles with it
Took it to a family friend who owns a garage when the oil light came on, he topped the oil up about a month- 6 weeks ago oil light came on again said it’s drinking engine oil said he would do any work but as it’s under warranty take it back and tell them your not happy and you want a refund? Is this possible?how does she stand as it’s bought under finance??
Any ideas
Took it to a family friend who owns a garage when the oil light came on, he topped the oil up about a month- 6 weeks ago oil light came on again said it’s drinking engine oil said he would do any work but as it’s under warranty take it back and tell them your not happy and you want a refund? Is this possible?how does she stand as it’s bought under finance??
Any ideas