I need some advice, returned goods

Basically i want to return an item for a refund, this is what has happend so far.

i ordered a number of items totalling Total: £174.39 from this website petzoo on 30/12/08, they arrived sometime after im not sure when. i decided 1 of the items which cost £58.99 i didn't need so i returned it by special delivery within the 30 days the website states on its returns policy unopened and emailed them the tracking code and my desire for a refund. the item i sent to them was deliverd (i have proof of delivery), i heard nothing back, i sent a further email asking for an update, i have still heard nothing.

i'm unsure what to do next i can't even get a response from them ?

i paid by a visa credit card but i was under the impression you could only use charge back if the goods were over £100, the total was but the singular item i returned wasn't.

becareful with that site, my kaspersky antivirus just told me all of its catalogues are full of trojan viruses,

whats even more weird is i just checked my credit card statement online and i can't find where i was billed for the transaction, and there is no pending transactions either, did i get the items for free ?



iv just gone from needing a refund to now not being charged ?

could my credit card company have blocked the transaction and i get the products ?