Crocs online is horrible and will not give my money back

I bought 2 pairs of crocs, one for me and one for my daughter. although when the box arrived only my daughters pair was in the box and we emailed to find out where the second pair of crocs were. and received no reply. for more than a week we have been trying to email requesting for the crocs because we were not getting anything back and then we asked someone to call on our behalf because we just did not have the time as my wife is now in hospital im working full time and struggling to find someone to care for my daughter while im at work, and after that call we FINALLY got one response to an email saying they did not have the pair in stock and is going to give us a refund and requested my banking details and it has been now more than 3 weeks and i have not heard back yet still have not gotten my money back and have not gotten any feedback and i am tempted to head out to crocs to actually go an fight for my money because this is very upsetting and i have so much to deal with and now this, please could someone help me get my money back.