As your settings are set to DHCP, which it should be for ease of configuration, essentially all the internet settings etc. are handled by the router.
Now if you have reset the router to factory settings without taking note of these in advance it is now highly likely all the configuration settings are now gone which is why you cannot connect to the internet.
As a workaround until your ISP tech support is able to fix it.
try the following settings:
IP: 192.168.1.100 (You may need to change this to the subnet of the router ie: xxx.xxx.xxx.100)
Subnet: 255.255.255.0
Default gateway: 192.168.1.1 (this should be the IP address of your router so you need to check this as it is probably different)
DNS Primary : 8.8.8.8 (Google DNS)
DNS Secondary: 9.9.9.9 (Google DNS)
Each device on the network should have a unique IP address to avoid an IP conflict, think of an IP as a telephone number.
IP = Phone Number
Subnet = Area code
Gateway = Local Exchange (how to route the traffic from your computer out onto the internet)
DNS = Look up web addresses such as
www.google.com and convert them to IP numbers and do the reverse.
PS: Bit tricky to remotely configure network stuff!