Correcting name: #211028-160059-527000

I need to correct the spelling of Mara Guil in her upcoming film Alegría, by Violeta Salama.

I took charge of her IMDbPro account, after her petition, to try to solve the different spelling ways she have been credited in the past. I managed to merge all her works into her correct name (Mara Guil) but in several titles she also appears (as Mara Guill) which is incorrect. 

I have been asked to prove her name with a caption of the final credits. But in her next premiere, Alegría, where she co-stars, the four main roles are not listed in the final credits. Nevertheless, I have contributed with promotional material (solo poster, and main poster) where her name is perfectly spelled but my contribution have been declined and I really don't know how to solve this, as the material offered is absolutely clear about the correct spelling.

If you could help me I will be very, very grateful. I attach again both posters.