Very unhappy customer due to poor service!

I have booked tickets on the 21 March but had to cancel on 22nd. I was told the refund will take 15 to 21 days minus the cancellation fee of course. I have now been waiting 33 work days (not counting public holidays or weekends). I have asked continuously on their whatsapp chat what the issue is and was told on Monday 6May the money will be in on Friday 10 May. Now on 11 May I'm told the money will be paid with the next batch. No time given and this has been ongoing way past the time I was told. This is unacceptable and very poor service. I went ahead after cancellation and still used intercity to book the new tickets they could've easily transferred the money but no! I really need my refund and this can't continue.