Hello Upekkha,
Sorry to hear about your problems.
I do not think it is the Mara (or more precisely Mara Devaputta), is the one who is making these problems. As I have discussed several times (see the links below), Mara Devapuatta is a deva of the highest deva realm. He wants people to do good deeds and be born as devas like him. However, he does not like people following Buddha Dhamma, because the Buddha has taught that one should pursue Nibbbana, and not strive to be born a deva.
There are “really bad beings” who try to confuse people and get them into trouble. Since you have had some problems in the past, you may have become a target. It is good that you are continuing those good practices, and with time I believe you be able to overcome these influences.
From your description it is not quite clear whether this “voice” wants you to do bad things or just stop following Buddha Dhamma.
Also, I do not think past discussions at this forum would have anything to do with your situation.
Following links may provide some more information:
“What Does Buddha Dhamma Say about Creator, Satan, Angels, and Demons?“.
“Attitude towards kamaloka devas“, which was discussion at this forum some time back.