MTN CONTRACT

I have been in contract with MTN for a while now that I ended up being eligible for an upgrade. I did the upgrade I received a Huawei android and iPhone 13 . The Huawei device got ****** I reported it immediately as ****** but until now the phone has not been blocked I have been through all their communications channels but up to now there is no resolution they are just sending me a monthly invoice that they expect me to pay . These 2 sims are not in use but every month there are call records populating on my invoice each month and the funny part is that it’s the same number being dialled out . I have my other sim but it just stopped working I have reported the issue even went as far as visiting their store oh what a waste of my money. I’m expecting to pay for a sim swap again although I have the sim but it just stopped working I have escalated this to their ***** line they all have decided they won’t respond and I have now decided I’ll stop paying them till further actions take place.