Getting wrong results when using switched-capacitor filter. (PSpice simulation)
How did you simulate the frequency response for the S/C circuit? Note that you must not apply the ac analysis in the frequency domain. This analysis is allowed only for linear - and time continuous - systems. That is the reason for not observing any influence of the clock frequency.

For finding/simulating the transfer function in the frequency domain you must replace all S/C blocks with time-continuous equivalent blocks. 

For this purpose there exist two basic techniques as described in the relevant literature.