Lenovo — lenovo ideapad 330 , issue with connecting to internet

Address:

Chittoor, Andhra Pradesh, 517501

I've purchased lenovo ideapad 330 in the month of august 2018. Every now and then.. When i start using internet, it doesn't work.. It shows.. "there is something wrong with the proxy settings or tge address is incorrect". I've taken my laptop to lenovo authorised shop where i bought my laptop regarding the issue.. Even they doesn't seem to understand... They simply change os and tell us it will work fine here after.. Same issue continued.. And i already took my laptop 3 times to that place regarding the same issue.. I bought this laptop to study and do course.. But it is of no use.. I couldn't use this laptop.. It is not even 5 months since i brought this laptop..