Liberty Shoes — want to change the shoe number from 3 to 4, today purchased from liberty online

Address:

Shivani Goyal, C-207 pramukh garden, opposite Yogihospitsl Silvassa DNH contact no. 9712592644, 396230

Tiday i purchased liberty shoe which is not fitting to my foot, hence i want to return 3 number shoes and want 4 number shoes on place of it. The size available on chart and the shoe size does not match as such the shoe doesn't fit me. And i want a replacement with 4 number shoe.
Ready if some additional charges are associated with it.
I had paid all money for shoes and now it is of no use for me hence i request that it will be good if a get my 3 number shoes with 4 number shoes