False information to make a sale

I Was contacted by Mondo regarding a cellphone contract. I explained to the sales agent that i would not qualify as i still had an outstanding debt of 3 years ago that i need to settle so even though my credit score is high right now it would be declined. I clearly stated that i did not want to do it as they would do a credit enquiry and it would be declined and affect my credit score negatively. She assured me that i have already been approved and that i need not worry as they would not need to do a credit enquiry. I then proceeded to agree as it was a really good offer. Weeks went by waiting for delivery of the phone and i even received another sales call where they attempted to sell me funeral cover trying to make it sound like it is part of the previous offer and that someone would contact me soon for my delivery. I declined the funeral cover when the agent simply wanted to add it without even telling me the cost. Few days later i called again to find out about the cellphone contract and when delivery would take place and was informed that it was declined due to credit record. The exact thing i told the agent on recording would happen. They did not bother to call or even send a mail to inform me about this. So now again they did exactly what i said i did not want to happen. My credit score has been negatively adjusted for 6 months due to their enquiry that i was told would not be needed to do as i was pre-approved. This is plain out false tactics to make a sale that i believe to be dishonest. And again from another sales agent pretending to call you for added bonus where he could probably also see that your offer was declined wanting to sell you extra cover and attempting to add it on without even telling you the cost. If i did not ask the cost he would simply add it. They have all types of cancellation fees that one would pay if you cancel yet from their side they cant even tell the truth when making sales or take any responsibility for their sales peoples actions. Calls may be recorded for quality purposes but not to protect the customer.