Samsung — fooling by changing hardware of mobile

i purchased samsung galaxy s advance on 9th august 2013, before buying i gone through the specification of the smartphone which showed arm cortex a9 dual core processor (still it shows the same). but my mobile started crashing and lagging so i thought it must be problem in the mobile, but after installing hardware info app it showed my phone was running on arm v7 dual core processor, which is pretty outdated i contacted samsung care they guided me to the nearest service station in near by my area, the service there was so pathetic they dont know even how to open motion lock of my phone, and started cursing me and blaming me and offered me to format my mobile without checking the hardware issue so it was damn irritating after which i contacted samsung tollfree help line they too were not responsive and said we dont have such service available to check the processor so i just want to know what further steps should be taken to resolve this dispute