diff --git a/src/common/enums/message.enum.ts b/src/common/enums/message.enum.ts
index 94c2755..112c9c7 100755
--- a/src/common/enums/message.enum.ts
+++ b/src/common/enums/message.enum.ts
@@ -410,7 +410,7 @@ export const enum BusinessMessage {
   DOMAIN_NOT_CONNECTED = "دامنه به سرور ما متصل نشد",
   DOMAIN_NOT_FOUND = "دامنه یافت نشد",
   DOMAIN_VERIFICATION_TOKEN_REQUIRED = "توکن تایید دامنه مورد نیاز است",
-  INSUFFICIENT_QUOTA = "حجم شما برای ساخت ایمیل کافی نمی باشد",
+  INSUFFICIENT_QUOTA = "حجم شما برای ساخت ایمیل کافی نمی باشد، لطفا حجم را افزایش دهید",
   QUOTA_DOWNGRADE_NOT_ALLOWED = "کاهش حجم ایمیل مجاز نیست، فقط می‌توانید حجم را افزایش دهید",
   QUOTA_AMOUNT_REQUIRED = "مقدار حجم مورد نیاز است",
   QUOTA_AMOUNT_MUST_BE_NUMBER = "مقدار حجم باید یک عدد باشد",
diff --git a/src/modules/businesses/constant/index.ts b/src/modules/businesses/constant/index.ts
index 5a949fa..c398437 100644
--- a/src/modules/businesses/constant/index.ts
+++ b/src/modules/businesses/constant/index.ts
@@ -9,7 +9,7 @@ export const SUBSCRIPTIONS = Object.freeze({
 });
 
 export const QUOTA_CONSTANTS = Object.freeze({
-  INITIAL_BUSINESS_QUOTA: 1024 * 1024 * 1024, // 1GB initial quota when purchasing dmail service (allows 1 user)
+  INITIAL_BUSINESS_QUOTA: 1024 * 1024 * 1024 * 10, // 10GB initial quota when purchasing dmail service (allows 1 user)
   USER_QUOTA_DEDUCTION: 128 * 1024 * 1024, // 128MB deducted per user creation
   DEFAULT_EMAIL_QUOTA_BYTES: 128 * 1024 * 1024, // 128MB per user in bytes
   QUOTA_PRICE_PER_GB: 100_000, //TOMAN
diff --git a/src/modules/users/services/users.service.ts b/src/modules/users/services/users.service.ts
index 8e1ba6d..b59a014 100644
--- a/src/modules/users/services/users.service.ts
+++ b/src/modules/users/services/users.service.ts
@@ -192,7 +192,7 @@ export class UsersService {
       // Check if business has enough quota
       const remainingQuota = Number(business.remainingQuota || 0);
       if (remainingQuota < QUOTA_CONSTANTS.USER_QUOTA_DEDUCTION) {
-        throw new BadRequestException("Insufficient quota to create user. Please upgrade your plan.");
+        throw new BadRequestException(BusinessMessage.INSUFFICIENT_QUOTA);
       }
 
       const domain = await this.domainsService.getDomainById(domainId, businessId);
@@ -246,7 +246,7 @@ export class UsersService {
 
       await this.userSettingsService.createUserSettings(user.id, em);
 
-      business.usedQuota = Number(business.usedQuota) + QUOTA_CONSTANTS.USER_QUOTA_DEDUCTION;
+      business.usedQuota = Number(business.usedQuota) + userQuota;
       business.remainingQuota = Number(business.quota) - Number(business.usedQuota);
 
       await em.persistAndFlush([user, business]);