Reliance Bigtv — unable to view all channels

My subscriber number[protected]. Using reliance big tv.
I can hardly view 4-5 channels. Other channels are not coming and gave error on screen. I have tried calling many times to customer care from last 2 months.
Either no one picks the call and it remains on waiting and when some representative picks the call, they will say server is busy and cannot check the details and ask to call after sometime. Only 2 times in 2 month could connect to representative when there server was working. One time they raised compliant and told someone will visit and fix the issue but no one came. Second time, they told, this is common issue with many customer and we are working to resolve on batches. All customer will be fixed soon before 27th jan 2018 and they will be refunded as they are not able to view channels but is getting charged on daily basis. Till now no luck.
Please help.