Airtel — Poor quality picture in night

Dear Sir, I have purchased Airtel DTH on 27th Sept.09. My ID No. is [protected]. Since then,it is not working properly in the night. I contacted ur representative (Mr.Amit & Mr. Gaurav) at Lucknow, but they did not attend the same. On 20th Oct. I lodged complaint at Customercare having reference no.1259150 but problem could not be rectified, when I contacted customercare in this regard, it has been informed me that they have received a message from local representative that "nobody was at home". Sir, it was a false report because we were remain at home. I again lodged complaint on 23rd Oct. Service reference No.was 1279875. I have received a message - ur service request reference no. is 1285115 for engineer related. On next day I again received a message that your engineer related reference has been resolved. Sir, I am sorry to say that the said problem is still existed.
Sir, my problem is DTH is not working at night. In day time, all the channels, except one or two channels, are working properly but in night its working is vice versa.