Gdtyjr

I am facing two types of problems with the table of contents.

First, I want to remove underlining (from the section titles) and bold (from the chapter titles) from the table of contents. The page now looks like this:

For context, the reason the section titles have underlined text is that I have used underline for all section titles, as given in the below picture, which is the university formatting rule for theses:

I do not know, though, why the chapter titles are turning bold.

The second problem is that, as you can see, the table of contents does not include INTRODUCTION as the first chapter. I did use chapter code for INTRODUCTION as well though.

The Latex code for my document is large, so I am just including the code until the first chapter (INTRODUCTION) below. I hope it helps.

documentclass[12pt]report
usepackage[left=1.5in, right=1in, top=1in, bottom=1.5in]geometry
usepackagesetspace
usepackageamsbsy
usepackagefancyhdr
usepackagelipsum
usepackagegraphicx
usepackageenumitem
usepackagetextcomp
usepackagelscape
usepackageamsmath
usepackagecalc
usepackage[rm,tiny]titlesec %added this to change the chapter title's font as default regular text font.

newlengthdepthofsumsign
setlengthdepthofsumsigndepthof$sum$
newlengthtotalheightofsumsign
newlengthheightanddepthofargument

usepackagepdflscape,booktabs
usepackage[flushleft]threeparttable
renewcommandTPTtagStyletextit 
usepackage[font=it,skip=0.5baselineskip]caption % italic text for captions

%to put page numbers as the header
fancyhf
fancyhead[C]thepage
pagestylefancy

titleformatchapternormalfontcentering0pt
titlelabel
titlespacing*chapter0pt-25pt4pt

titleformatsectionnormalfontcentering0pt

%koleygr: Redefining chapter to include thispagestylefancy
letoldchapterchapter
makeatletter
defchapter%
@ifstar@Starred@nonStarred%

def@Starred%
@ifnextchar[%
GenericWarningWarning: A starred section can not have parameters. I am going to ignore them!@StarredWith%
@StarredWithout%
 
def@StarredWith[#1]#2%
oldchapter*#2%
thispagestylefancy

def@StarredWithout#1
oldchapter*#1%
thispagestylefancy

def@nonStarred%
@ifnextchar[%
@nonStarredWith%
@nonStarredWithout%

def@nonStarredWith[#1]#2%
oldchapter[#1]#2%
thispagestylefancy

def@nonStarredWithout#1%
oldchapter#1%
thispagestylefancy

makeatother

interfootnotelinepenalty=10000

begindocument

setlengthheadheight50pt %to note where the header lies.
setlengthheadsep15pt %to set the distance between header and the first line after it.

renewcommandheadrulewidth0pt
doublespacing
thispagestyleempty
begincenter
vspace*0.2in
THESIS TITLE\
vspace*0.4in
by\
Samyam Shrestha\

vspace*1.2in
singlespacing
A thesis submitted in partial fulfillment\
of the requirements for the degree\
doublespacing
of\
Master of Science\
in\
Applied Economics\

vspace*1in
UNIVERSITY\
University location\
vspace*0.2in
Date
endcenter
pagebreak

pagenumberinggobble
begincenter
vspace*1in
textcopyright COPYRIGHT\
by\
Samyam Shrestha\
2019\
All Rights Reserved
endcenter
pagebreak

begincenter
ACKNOWLEDGEMENTS
endcenter

Acknowledgement text

pagebreak
tableofcontents

pagebreak

begincenter
ABSTRACT
endcenter
singlespacing
noindent
Abstract text\


pagebreak

pagenumberingarabic
setcounterpage1
doublespacing

chapterINTRODUCTION

Introduction starts

Thanks loads!