Transmission not shifting

You need to redo this question as it's hard to understand, if this is a C6 it should only have 1 in d1 and shift once in d2 and twice in d3 as it's only a 3speed. You could have an accumulator problem or a governor problem or it may be a loose valvebody, etc this should be guaranteed for 12k miles so take it back to where it was fixed. Check your fluid as well for being full