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@Soweto888
Yeah, I've had this problem. Are you absolutely sure that the bottom bracket threading is compatible with the frame? If so, I'd be prepared to bet that chasing the threads of the bottom bracket shell will solve the problem, even if they don't look that dirty just now. Those horrible plastic retainer rings aren't very forgiving. The shell threads need to be just so.
Btw, make sure you don't stuff up the threading on the plastic ring cos it's bloody hard to get a new one as a spare part without ordering online.