Dear @lunawat, You have posed an interestingly ticklish quarry, therefore the reply should also be ticklish.
Tell me how did you came to know your wishes were heard by your deity, when you visited your place of worship last time ? Did you test it or was there a Receipt?
I am sure, none of us has such knowledge and still we visit to our temple, mosque, Gurudwara or Church wherever we pray. We do not even ask the Godman also whether our God acknowledged the prayer, we just did. Evidently, the Godman too is incapable to vouch for such acknowledgement.
Dear Sir/Madam, to know such transmission of energies (as happens through VK), we have to elevate ourselves. As this is no chemical or physical process that we may TEST it. The only way to know whether we have been able to avail the blessings of VK, are the results and results will come through practice and faith. In the process, as your psychic abilities grow, you may feel the energies yourself.
So instead of examining whether VK is performing, my suggestion is, please prepare well and sit for the exam yourself. Experience will gradually develop your insight to know the exchange of energy. Till then, keep faith, on the long list of Testimony and I assure you will appear as one testifying same with your own experience.