A P Batteries - Nairobi

I bought a battery NS 40(serial no ********) on 3rd Oct 2011 from your Meru depot but it did not give me good service.The battery keeps going down and i have complained several times at your meru depot but they have not given me a lasting solution. I returned it on 17th Oct 2011 because it kept going down,it was checked and said to be good but after several days the same problem continued..
On 24th Jan 2012 i returned the same to the meru depot because the problem is getting out of hand, i had to keep jam starting almost every morning.The attendant at your office said he was going to send it to Nairobi for check up.Kindly give me a lasting solution because all this is causing me alot of inconviniences.