POOR SERVICE

Good day

I bought the sonny experia at exact gateway on the 23rd of May and when i get home the device has no sound, i can only use it when am using earphones but because i was working on the following day i couldn't take it back. When i take it back i was told that the person who is dealing with the devices he is not available i need to come back on Monday the following week. I returned the device and i was told that they will book it in for repairs my question was whose fault is that the device has no sound and did't get the response because i can't buy the device and within 7 days its already damaged. Am so disappointed with their poor service even today i don't have device