Your Rank is based on your amount of Influence Points and not based on what pledge package you have. As a Baron spending $250 you should be Rank 7. Are you absolutely sure your purchase went through? you have the receipts? your account states you have the Mayor/baron package? are you sure you've outright bought it and not placed it on a layaway? (not sure if layaways are still around which is why I ask) if it's on layaway then you don't obtain that rank until it's paid off.
Tiers/Ranks:
1 (400 Influence),
2 (700 Influence)
3 (1,000 Influence)
4 (1,200 Influence)
5 (1,750 Influence)
6 (2,250 Influence)
7 (2,500 Influence),
8 (5,000 Influence)
9 (7,500 Influence)
10 (10,000 Influence)
11 (50,000 Influence)
12 (100,000 Influence)