2 month old Macbook 15" Retina Green Light But not Charging

It's connected but not charging, sometimes it goes green, sometimes red and sometimes no light on power supply cord. When I look closely on the connector two alternate dots of the four have dark shade marks around them that was not there before. could it be the power supply cord or is it the battery?

It there a way to fix it.. what is odd is that when it is plugged in it stays at the same percentage of battery charge, and sometimes it actually starts charging gets to around 80%+ and stops while other times just keeps the current charge. Any thoughts?

Battery Information:

Model Information:

Serial Number: D86240333AQDNMGAE

Manufacturer: SMP

Device Name: bq20z451

Pack Lot Code: 0

PCB Lot Code: 0

Firmware Version: 511

Hardware Revision: 000a

Cell Revision: 1150

Charge Information:

Charge Remaining (mAh): 2431

Fully Charged: No

Charging: No

Full Charge Capacity (mAh): 7945

Health Information:

Cycle Count: 182

Condition: Normal

Battery Installed: Yes

Amperage (mA): 0

Voltage (mV): 11280

System Power Settings:

AC Power:

System Sleep Timer (Minutes): 58

Disk Sleep Timer (Minutes): 0

Display Sleep Timer (Minutes): 58

Wake on AC Change: No

Wake on Clamshell Open: Yes

Wake on LAN: Yes

AutoPowerOff Delay: 14400

AutoPowerOff Enabled: 1

Current Power Source: Yes

DarkWakeBackgroundTasks: 1

Display Sleep Uses Dim: Yes

GPUSwitch: 2

PrioritizeNetworkReachabilityOverSleep: 0

Standby Delay: 4200

Standby Enabled: 1

Battery Power:

System Sleep Timer (Minutes): 20

Disk Sleep Timer (Minutes): 10

Display Sleep Timer (Minutes): 15

Wake on AC Change: No

Wake on Clamshell Open: Yes

AutoPowerOff Delay: 14400

AutoPowerOff Enabled: 1

DarkWakeBackgroundTasks: 1

Display Sleep Uses Dim: Yes

GPUSwitch: 2

Reduce Brightness: Yes

Standby Delay: 4200

Standby Enabled: 1

Hardware Configuration:

UPS Installed: No

AC Charger Information:

Connected: Yes

ID: 0x0000

Revision: 0x0000

Family: 0x0000

Serial Number: 0x00000000

Charging: No