International calling crisis

I bought airtime to call Lesotho,I can’t place a call as international calling is deactivated i tried to sort that out from but failed called the customer centre I didn’t get any help,was advised to visit the store which I did still I didn’t get any help…am stuck with the airtime that I can’t use as I bought it specific to call Lesotho ,oh well as for the app also no one can help me as well ….