The problem is that we have none of Montanus' writings or any of his followers writings, we are hearing the opposition but not Montanus because his writing were destroyed.
Notice, however, that there are several different writers who condemn Montanus. Each makes the same accusation against him. There is no reason other than pure speculation to think that Montanus did not make these statements.
but they are his opponents, say if we only had the statements for a certain person, Bill Clinton or George W. Bush for instance, let all their opponents skew their qoutes for their human benefit, it is human nature that is why it happens.
I am not saying Montanus was right or wrong, I don't know, we can suppose his opponents were truthful, which as Christians they should have been, but the lacking of spiritual gifts is dangerous for the Church, because one of those gifts is discernment, how can we discern what is the acceptable will of God without it, even with scripture, we should discern, tongues was being rejected, and God was being put in a box, but i promised not to debate so i am not saying that I would have not done the same thing to Montanus, modern pentecostals beleive in the active nature of the Holy Ghost, which is something that we supposedly share with Montanus.