Misled by the sales agent

My husband and I went to the promenade mall to purchase a decoder but the lady at the stand said you no longer give decoders you give out 2 years contracts. My husband and I agreed so he opted for the R250 package which was the lowest and we were told it will be installed on the 4th of Febr now on the day of installation i overheard the installation guy talking to someone on the phone saying that he should activate the R550 package I was like no that's not right he said we should speak to dstv my husband came back from work and we went back there the lady was not there there was a guy that seemed like a manager he said it will be fixed and we were okay with that. So on the 27th of March I checked my husband's bill it was R181 so I paid R200 to an incorrect customer number then I paid R182 to the correct one. Sent an email to you guys and you credited that R200 to his account. On the 28th or 29th of March you debited R298 from his account so I asked him to reverse it because he owes Over R500 as from the 2nd of April how because R182 and R200 are more than his R250 bill and the services are disconnected why because this package is R250 and if you didn't change it from R550 to R250 I want it canceled ASAP because its clear that you do not want to fix it then come and take your stuff.