Motorola — Mother board complaint

I have bought moto e2 in the month of March and within a period of 5months the speaker stopped working.so in the month of August I have given in service center in rahahmundry, after a span of 14 days they told that the problem is with mother board.and they told that it takes still 2weeks to solve it.how it so simple to put mobile all the time in service center .I don't understand why Motorola cheats customers by installing worst mother boards.the service is also not good.please provide justice.