Confused - not sure if critical illness will cover my BC

Hey guys, 

             I’m in the middle of researching of my critical illness will cover my breast cancer . My diagnosis confirm invasive cancer and these words are mentioned several times . However after a mastectomy and lymph removal my discharge paper work etc says all 3 rumours were within the field of insitu . I’m now confused if it was invasive or insitu ? The insurance company only seem interested of it says invasive . Which it deffo does on my diagnosis . Any ideas guys . Thankyou xx