Bad customer service and unfair billing

On the 14/05/15 called mweb to sign up for contract. Anton Adams didn't understand what I was looking for & sent me a 3G Modem. I called again on the 18/05/15, spoke to Akhona Mboniswa advising her that I'm actually looking for a mobile router and not a 3G Modem. On the 20/05/15 they sent me another 3G modem, so I was seating with 2 incorrect products. Called again to advise them. On the 25/05/15 they sent the correct router and I sent back the 2 3G modems. But there was no sim card, so I called them again to advise them, I was told I should have kept 1 sim card from the 3G modems? No one told me to keep 1 sim card? I received a statement indicating that I must pay for the delivery of the modems, I sent an email to the billing department that I will not pay as it was not my fault their agents sent me incorrect products, a call was logged. To my surprise my acc was debited on the 30th? Why? I haven't even received the sim card? The call that I logged was still not resolved. There's no activation what so ever. I want to cancel the contract, they must come and collect their router. Bad customer service indeed.