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Using changelly certainly was a one time mistake for me.
I'm letting you know, because I whish somebody would've told me before....
I never had an issue with changelly and i am using their site and not through a third party and i never encountered any issue but i have encountered certain issues with shapeshift in the past but the support would sort the issue within a couple of days.
I have seen your last topic regarding the same issue and repeat the process what you did last time and the support will sort your issue and hopefully it will not take 20 days.