Hey Hamza, Ok so this is usually down to timing or not getting the right contact on the ball. Normally if you play a slower heavy topspin shot and the opponent blocks the ball back it will come back slowly and without much pace but still has a fair bit of topspin on the ball. So the key is not to rush this shot and make sure you press into the ball with the rubber as you contact, almost like a very short forehand drive shot.
If you find these are still going in the net it might be that you actually need the start to play more of a short topspin stroke against these blocks, so trying to keep a short stroke and just brush forward over the ball with a bit of acceleration, this will stop the ball going in the net when the block comes back very slowly. Let us know how you get on trying these two things. Tom 🙂