Airtel — outgoing calls not going

I am on a rs.399/- package valid for 70 days till first week of december, 2018, i think it is till 06.12.2018. Since last 4 days outgoing calls do not materialsie from my cell no. [protected]. When the present 4g sim is replaced by an another 3g sim. It works. On enquiring i was told that i have to recharge rs.35/- as 30 days have laspsed since last recharging. I have not been informed on this but however i have rechaged through online rs.35/- today afternoon. But still the problem persists. Again this valididty is for 28 days for around rs.26/- but it says 'it expires by 06.12.2018. Please clarify on the valididty, balance etc. And solve the above problem of 'outging calls not going' immediately.