now the exchange had did something speed increased to 8mbps but while downloading from any device its coming upto 1mbps
i think its about the telephone line wire problem and change into a new wire.Suggest any opinion about this situation.
there may be some issues with the line itself. tell them to check the line. it may not only happen with the telephone wire in your premise it can also due to issues with the line pair that is coming from the exchange.