Extremy bad service

i got a email from google adds stating i got R600 credit and should try it out, i then signed up and tested it, i saw it didnt work and disconnected it. this month, 5 months later i got billed, i have sent endless mails to google adds stating i never signed up for the premium version i was only testing it out with the R600 credit i got. then i received a email back from them stating that there was no transactions done on my account, i then sent the transaction to them via screen shot. they then came back and told me i have to pay to use the credit??????? this was not on the email, the email they sent me with the promo code clearly stipulates that i have received R600 credit. i have told them that the line as canceled and that i never wanted the adds to run, they dont work anyway. now they have deducted money from account and are refusing to refund me. this is a MAJOR **** and i will be putting this on every platform that i know of to let people know what a **** google adds are??

how can you give me credit and then tell me i have to spend to get the credit? how can you tell me that no transactions went off on my account when there clearly went money off my account?? how can you tell me that the system is working when i am clearly giving you the evidence that your system is not working

you are *****ing and ******** people and this is against the law

i can be contacted on ***