Is it Pepper plant virus or disease?

[jawadhashim]

I grow different pepper plants in container (Bell pepper, Sweet Pepper, Jalapeno Pepper etc) but all lead to same faith and all died after sometime starting from leave curl.
Over the internet the reason found are ranging from heat to virus and solution is to discard the plant to protect other plants although I change pot, I change plant mix, I change soil and manure ratio, change watering habit, change location Shade/Sun but to no avail and all plants die after the leaves start to curl.
Can you please look at the following image and suggest me what the issue is? how to cure them? and how to avoid it in future?

Note curl leaves, Rust spots and thickness of leaves

[Izhar]

This is calcium deficiency....

[jawadhashim]

I did used Osnate 800 tablet as well (crushed and added with water and sprayed it over plant) to remove calcium deficiency. but look like that did not worked as well.
So any other idea to overcome this issue?

[Izhar]

Take coal/charcoal ash... get wood or charcoal ash 1 tablespoon, add little water to make as slurry, add two tablespoon common vinegar, leave this solution for 10 mins, add more water to make a suspension, give this whole suspension to your plant... the new leaves will be fine inshaAllah but the old one will remain same... use this solution twice weekly...