Mango... no after purchase services or assistance

I'm quite astonished that Mango Airlines do not assist in after purchase services... We booked a flight for a family member 2 months in advance and now need to ask for assistance with a wheelchair because the family member broke her leg and will need assistance boarding the plane. I have tried countless times to reach them and have sent emails with no reply. I am so unhappy that mango seems to have become a 3rd world company which cannot provide proper services and after purchase services. We have flown with them about 6 or 8 times this past year alone and this is not acceptable.