Hassle to get a new TV and ny account nit coming down

I purchased a smart TV from Lewis store and I am still paying it off my account doesn't seem to be coming down after I've been paying my account off for about three years the account only came down by R4000 yet I put R2000 a month, back to the Smart TV I purchased...... it broke 4 times already and they keep taking it and fixing it just for it to break again two months down the line as I write this my TV has just broken for the 5th time the store refuses to replace it as I pay insurance which is almost up and they won't be able to do anything else from there as advised by the store manager himself his statement was that the sameb TV I purchased alot of people are bringing back. Then why put something like that on the shelf and only tell customers it is a faulty brand once purchase has already been made. I mean who buys a broken umbrella for rainy days???? Please help I don't know what else to do I am extremely frustrated with Lewis store!!!!