Lenovo — charger replacement

Purchased one charger at lenova center at chaitanyapuri hyderabad. With warranty for three months 0n 27.01.2018. It was get out of order on 24.02.18
When i approached the center for replacement the centre confirmed that the unit is not working and asked me to come on monday by 5 pm on26.01.2018. I asked the front office executive to keep the charger with them since it is spoiled they refused to keep the charger with themwhen i telephoned to vikram the centre incharge he again tells that i shoud come by 6.30 pm on 26.01.2018. I opine that they supplying faked chargers.in the process lenova is loosing the good will. Pl instruct them to replace the charger immediately lest i will approach consumer forum