Sigh.

There is a big difference between CELTA and DELTA. Look it up or stop talking about it as you just make yourself look silly.

I have always said a relevant degree + teaching certification (ideally PGCE, but if not a CELTA at a pinch) should be the minimum requirement to teach. So I'm not sure why you can't get past this.

I also believe that working towards obtaining a DELTA after getting a minimum of 2 years teaching experience is a good idea for anybody wanting to continue their growth ad a teacher of ESL.