You are leaving out the eeprom memory location from your code.
void writeBytes(int device, unsigned int Address, byte* data, byte len)
{
Wire.beginTransmission(device);
Wire.write(Address >>8 ); //MSB
Wire.write(Adderess& 0xFF); // LSB
Wire.write(data,len);
Wire.endTransmission();
delay(5);//small delay for eeprom to save data
}
You need to be careful of page boundaries with block writes to an external eeprom. I would echo the sentiments of reply#5 and consider using the Christensen library.