Airtel — Full talktime Recharge amounts are fake in portal

The filtering for recharge is not as per mobile number provided. In website they are providing different data for full talktime recharges, but if we do, they are telling that is not applicable for your number. When we contact customer care, they are telling only through mobile you can check and recharge, then why do they want to use a website for recharge????????? They are indirectly grabbing the money from us telling the name of technical issue Such a website challenges for fastest network, but why cant they do challenge for not giving such money grabbing methods like this... very bad.. they are costing us so much and when we ask they are telling it is because of problem in website.. because later they will tell offers in website is not related to your number.