Validator not validating the request in Laravel 8 - laravel-8

Question

I am inserting the data. The data is being entering quite fine but whenever I enter a letter the entry is done but that entry is converted to '0'.
This is my controller store function:
public function store(GuidanceReportRequest $request)
{
$stats = GuidanceReport::where('user_id', $request->user_id)->whereDate('created_at', now())->count();
if ($stats > 0) {
Session::flash('warning', 'Record already exists for current date');
return redirect()->route('reports.index');
}
if ((!empty($request->call_per_day[0]) && !empty($request->transfer_per_day[0])) ||
(!empty($request->call_per_day[1]) && !empty($request->transfer_per_day[1])) || (!empty($request->call_per_day[2])
&& !empty($request->transfer_per_day[2]))
) {
foreach ($request->category as $key => $value) {
$catgeory_id = $request->category[$key];
$call_per_day = $request->call_per_day[$key];
$transfer_per_day = $request->transfer_per_day[$key];
if (!empty($catgeory_id) && !empty($call_per_day) && !empty($transfer_per_day)) {
GuidanceReport::create([
"user_id" => $request->user_id,
"categories_id" => $catgeory_id,
"call_per_day" => $call_per_day,
"transfer_per_day" => $transfer_per_day,
]);
}
}
} else {
GuidanceReport::create($request->except('category', 'call_per_day', 'transfer_per_day'));
}
Session::flash('success', 'Data Added successfully!');
return redirect()->route('reports.index');
}
This is my Validation Request code
public function rules()
{
$rules = [];
$request = $this->request;
if ($request->has('transfer_per_day')) {
if (!empty($request->transfer_per_day)) {
$rules['transfer_per_day'] = "numeric";
}
}
if ($request->has('call_per_day')) {
if (!empty($request->call_per_day)) {
$rules['call_per_day'] = "numeric";
}
}
if ($request->has('rea_sign_up')) {
if (!empty($request->rea_sign_up)) {
$rules['rea_sign_up'] = "numeric";
}
}
if ($request->has('tbd_assigned')) {
if (!empty($request->tbd_assigned)) {
$rules['tbd_assigned'] = "numeric";
}
}
if ($request->has('no_of_matches')) {
if (!empty($request->no_of_matches)) {
$rules['no_of_matches'] = "numeric";
}
}
if ($request->has('leads')) {
if (!empty($request->leads)) {
$rules['leads'] = "numeric";
}
}
if ($request->has('conversations')) {
if (!empty($request->conversations)) {
$rules['conversations'] = "numeric";
}
}
return $rules;
}
Although I check the type in which request is being sent from controller and recieved from the request validation and it is Object. So how can I solve the issue.