1. Since they are two separate transacions from two different ebay accounts, file two different consumer complaints since the cause of action in either would be independent of the other. As and when they do come up for hearing, you may request the consumer forum to hear both matters together.
2. If you've placed the orders from Delhi, made payments from Delhi, sought delivery of the order in Delhi, you can make a consumer complaint in Delhi. Mind you, it might be dfficult convincing the district consumer forum on territorial jurisdiction, but pace reliance on State Commission decion in Air Deccan v. Ram Gopal Agarwal (2013) a beautiful exposition on territorial jurisdiction in online contracts.