Bad Service from Dropstore

I had a subscription with this company for a month and then they deducted as they should. I then realised I don't really need their services so I cancelled the subscription and they sent me a confirmation email confirming my cancellation but the next month they still deducted money from my account. How & why? I don't know. I contacted them about the issue and forwarded their confirmation email of my cancellation, proof of deduction and my bank statement but they are still beating around the bush and not giving me back my money. Bad bad service from Dropstore. Wouldn't recommend for anyone to have a subscription with them.