TFG 6 months interest free ****

I went to buy an iPhone at the Hi store in Gateway today and I was told I could use my tfg card which I opted for. Google advised that the 6 months is interest free whem purchasing a cellphone. When I get into the store they say it's not interest free on devices only clothing. They called the call Centre and I spoke to Lusanda Dlelane who then advise it's not interest free on devices. I asked where about in the terms and conditions doesn't it state that or their policy. They said they don't have it stated anywhere and I asked how could it be a policy when Google states otherwise.