Thank you for your responses. Here is my whole story.
I had been denied boarding in London Gatwick by EasyJet who maintained that my Residence Permit Application Form (Ikamet Izni Muracaat Belgesi) was not a valid substitute for a visa, despite it being explicitly described as such in English on the form. After visiting EasyJet customer service they acknowledged that they were wrong and changed my booking to their next flight to Izmir, 3 days later and after my 15 day grace period had expired.
I went ahead and purchased a new e-visa. Based on my bad experiences the previous time,