Foschini spam calls

I'm constantly receiving spam calls from Foschini ***), up to 6 calls a day any time from 8am to 10pm and its been going on for MONTHS. The one time I decided to be nice about it and answer to get them from my back the gentleman was very nice but when I said no to receiving promotional communication he hung up on me and the next day the calls just continued. I'm so fed up I've never been in a situation THIS bad, I decided to close my account with them if I don't hear anything from them and the calls stop very soon