diff --git a/app/Models/Service/Adsl.php b/app/Models/Service/Adsl.php
index 31a6f23..d56b503 100644
--- a/app/Models/Service/Adsl.php
+++ b/app/Models/Service/Adsl.php
@@ -159,7 +159,7 @@ class Adsl extends ServiceType implements ServiceItem,ServiceUsage
 
 		// If we are before the 15th
 		if ($start->day < 15) {
-			$start = Carbon::createFromFormat('Y-m-d',$start->subMonth->format('Y-m-').'15');
+			$start = Carbon::createFromFormat('Y-m-d',$start->subMonth()->format('Y-m-').'15');
 		} else {
 			$start = $start->subDays($start->day-15);
 		}
diff --git a/app/Models/Service/AdslTraffic.php b/app/Models/Service/AdslTraffic.php
index 7fc8ba0..016f4c1 100644
--- a/app/Models/Service/AdslTraffic.php
+++ b/app/Models/Service/AdslTraffic.php
@@ -23,6 +23,10 @@ class AdslTraffic extends Model
 
 	public function getTrafficMonthEndAttribute() {
 		if ($this->date->day > $this->traffic_end) {
+			// If we are the last day of the month, we'll temporarily take 3 days since Jan 31 and addMonth() results in March.
+			if ($this->date->isLastOfMonth())
+				$this->date=$this->date->subDays(3);
+
 			return Carbon::createFromFormat('Y-m-d',$this->date->addMonth()->format('Y-m-').$this->traffic_end);
 		} else {
 			return Carbon::createFromFormat('Y-m-d',$this->date->format('Y-m-').$this->traffic_end);