Selectsys .NET Developer interview questions

The interview went well, but the interviewer had a lot of network issues they asked me questions on .net, react, sql, c#,JS, project related questions. the interviewer said they were satisfied with my responses but ghosted after the interview. i called hr and he was asking for resume again i explained my interview is completed then he said okay let me look into it and get back to you and he just said feedback was negative and they didnt specify any reason