HappyEasyGo — Cancelled Ticket not refunding

I have book my tickets back in April and cancelled them immediately but the refund is not getting credited and also cancelled immediately but it is kept showing processing and processing over these months but still the refund is not getting and no update from them and I have tried a lot effort in asking them by doing mails and calls every time this is sorry sir sorry for the inconvenience it will take a few weeks to get your refund back but now it's too much of a word and I want my refund as well as the interest over this time or should I file a legal case against you for harassing compensation
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