Ice Spice 's debt drama is getting harder to brush off ... because the rapper is now scheduled to sit for a deposition in her ongoing wig-company lawsuit. According to new court documents, obtained by TMZ, Ice Spice -- whose legal name is Isis Gaston -- will sit for questions under oath in September in Manhattan as part of the legal battle brought by Thee Bella Brand LLC. As TMZ previously reported, the company sued Ice Spice last year over 25 custom-made wigs ... claiming she agreed to